So I'll not comment on the suggestions themselves here, but I will throw in some math for comparison as it's something I've gone over. Let's compare battle cleric and abjurant spellsword
AC:
Cleric gets
10 base
14 armor (8 plate 1 dex 5 magic vestment)
8 shield (3 tower shield 5 vestment)
4 natural from bark skin wands (5 with plant domain or sequencer)
5 deflection shield of faith
6 tumble
2 armor skin
4 haste
1 mage armor
1 boots
55/56 ac, of which 12 plus dex is lost to flatfoot, 15/16 of which is dispellable and 7 of which is breachable
Abjurant gets
10 base
14 armor (imbue instead of vestment)
7 shield
4 deflection shield spell
4 natural bark pot or 5 with sequencer (which Ss can use a bark sequencer if they find people to make them, and I know they exist)
4 weave ac
4 haste
3 tumble
2 armor skin
1 mage armor (2 with greater mage armor)
1 boots
54/55/56 ac, so if they get a bark skin sequencer and use greater mage armor they are an equal to cleric with +5 bark. Only 13 of this is lost to flatfoot because SS gets uncanny dodge, only 10/11/12 of which is dispellable, and only 5/6 of which is breachable
AB
Average human cleric ends with 22/24 strength but I believe the 24 strength one takes great strength and might not be able to fit possess. Average human abjurant ends on 28 strength
Cleric
20 bab
12-13 strength (fully buffed)
5 div power
5 div favor
4 weapon
3 ewf
1 prowess
2 battle tide/war cry
1 prayer
1 aid
1 bless
55/56 ab (56 being if they both have 13 strength modifier and epic prowess), of which 15 ab is directly dispellable and 2-3 of which is dispellable if bulls strength is dispelled
Ss abjurant
20 bab
15 strength
5 weapon
4 weave ab
3 ewf
1 prowess
2 warcry (and I know some who go for aid Wands)
Fire imbue armor
50 ab, 51 if they do get aid, of which only 2 or 3 of which is dispellable directly and 2-3 more if bulls strength is relied on, plus fire armor imbue is a bonus that is undispellable
DAMAGE
Let's say that both SS and cleric use the same weapon for the sake of math, and that it's a unique +4 as the case of SS using an m.damask scimitar makes the problem even worse than below
Cleric damage bonuses are
Strength - 12-13
Divine favor - 5 magic damage
Battle tide/war cry - 2
Deafening clang - d8, d10 if you're a 27/3 warpriest or seeker
SS abjurant gets
Strength - 15
Warcry - 2
Elemental weapon - 2d8+2 where the 2 is utterly irreducible
19-20 plus deafening in cleric, 19 plus 2d8 on SS putting it up about 4 damage, and this disparity is made worse if the imbue is magic since magic is largely irreducible
However elemental strike is a max ab attack that empowers if the damage matches with the imbue resulting in an instant attack at max AB which does 3d8 more damage and has interactions that means epic dodge doesnt outright ignore it and overcomes the NWN adage of "to win in melee just press down W" since it can be used on the move, on top of the special elemental strike effects such as a burn or vulnerability or life steal or apr reduction and potential slow
ATTACK PROGRESSION
While it seems cleric has more overall AB in spite of how much more it loses, this advantage is lessened by the attack progression
Hasted cleric
0/-5/-10/0/-5
Hasted SS
0/-5/-10/0/0
This is because elemental strike being instant eats what would be the second -5 attack, and a higher attack progression is fantastic because it means that many more attack will likely land AND confirm criticals, on top of the aforementioned bonuses of being an instant attack
STAT SPREAD
Everyone needs int for skill points. Int is a stat everyone needs where as wisdom and charisma are not universally useful, on top of spellcraft being an int skill for more spell saves
This means that SS has a lot more room for stats because they only need to invest in strength, con, and enough int to get 18 int
Meanwhile cleric needs strength, con, int, and then 19 wisdom on top. This results in the comparative level 1 and 30 stat spread for cleric vs abjurant of
Abjurant - level 1
17 strength gifted to 19
9 dex
14 con
16 int gifted to 18
8 Wis
8 charisma
Level 30
28 strength from 7 into strength and enough bonus feats to get 2 great strength
9 dex
14 con
18 int
8 Wis
8 cha
On top of having 4+int skill points for 8 skill points per SS level
Cleric - level 1
15 strength gifted to 17
8 dex
14 con
14 int
16 Wis gifted to 18
8 charisma
Level 30
22 strength from 5 into strength, 24 if they put in 6 and take a value of great strength with limited epic feats
8 dex
14 con
14 Int
19 wisdom from 1 into Wis if 24 strength, 20 Wis if 22 strength
8 charisma
As well as only having 6 skill points per cleric level
FEATS
abjurant:
Ss gets 3 bonus feats pre epic. Spending 2 for the abjurant path tax and the path itself that's 1 pre epic bonus feat
In epics because ss 30 is optimal they get 3 bonus epic feats AS WELL AS esf abj for free whilst having BREACH RESISTANCE and 30 CL
Cleric:
Cleric gets no bonus pre epic feats, and needs to go 27/3 and thus only gets 2 epic feats
On top cleric does not get esf abj for free AND needs to take ad abj
Cleric is thus down 2 pre epic feats for both the ad abj tax and no bonus feat and 2 epic feats for the same reason compared to abjurant. This can be argued as one epic feat since abjurant takes AS3 but cleric is still down in feats, doesn't get breach resistance by default, AND only gets 29 CL
QoL and misc features:
SS gets a pixie
Ss armor imbue gives 30% elemental DI and 15/- vs element where shield imbue is 15% and 7/-, both being massively up in a cleric
Imbue armor and shield don't take up spell slots where cleric needs to use magic vestment
The SS armor passives means they gain even more ac or ab or 4 Regen, gaining even UNDISPELLABLE NO SPELL SLOT COSTING regeneration and negative weapon imbue life steal meaning they gain more life per round than a cleric with regenerate does
SS even gets haste as a 3rd level spell where cleric gets it as a 5th level spell, 4 with travel domain. Then SS conveniently gets warcry as a 4th level spell so USING HASTE AND WARCRY DONT EAT THE SAME SLOTS AND ARE A LOWER LEVEL than cleric and thus get more casts. Mda while battle tide is ALSO A 5TH LEVEL SPELL for cleric so your casts of haste and battle tide on cleric conflict immensely and this point is A HUGE ONE I AM CAPITALIZING SO PEOPLE DON'T IGNORE IT AND READ THIS
I am sure there is more I'm missing but I'll end here for now
MORE MATH TO COME AS I FLESH THIS OUT AT WORK
Addendum (Windup): Clerics suffer significantly when it comes to the time taken to be fully functional compared to a spellsword.
Spellsword Windup: Haste, Warcry (6 seconds / 1 Round), 9 if they trt acid sheath too
Cleric Windup: Haste, Div Favour, Div Power, Prayer, Bless, Battletide/Warcry (18 Seconds/ 3 Rounds), then another half round if they go for a damage shield
Meanwhile if the cleric and SS fight, while the cleric is buffing this gives more time for the SS to mords or g.dispel