The problem is more with shields than bswords. Shields simply have no point right now, their puny defensive advantages don't offset the huge offensive trade off
Vanguard is the only real way to salvage them, with the speed bonuses approximating swf while being able to take thf for strike through. But that requires a pure or near pure base pal or base fighter. And pal lacks the bonus feats needed to make it work, unless you're going to just wait till 31 with shield spec (which honestly isn't missing much)
So really, logic suggests you have two good options for leveling in the build. An 18/1/1 pdk fighter fvs and probably warlock, Cha based with trance, can take Helm, enough feats for thf and shield mastery and all the other melee goodies. T5 kensei, core 5 vguard, splash stal def, war soul trance, and es aura for arcane warrior. Fiend pact lets you auto trigger EA mantle for debuff too.
18 pal 1 fighter 1 lock, cha pdk as above, and just skip shield feats till 31. That would let you T5 kotc to get blessed purpose (no capstone though) and heals+buffs, but gives up a lot of mp and defense in kensei and the bonus armor feats from fighter. LoH+remove disease is kind of a sideways trade with second wind. Or you could lean waaay into speed on that split, since you get your crit from holy sword, 41 vkf 31 vguard 8 kotc
Sun blade swash is also worth mentioning, but the big concern there of course is the very specific weapon selection. We just got a new endgame sun blade which bumps the viability a lot, but you have to worry about future proofing as level cap goes up, and you'd have to acquire a couple raid weapons on the char before you even think about TRing into that build.
Also probably should be disclaimed... Both the fighter and pally build would be far easier to just level with sos/esos to 31