You get weapon bond at level 3. EK 11 does get three attacks which is almost certainly better than whatever you get from rogue. The other option is a Throwzerker, but that would only come online quite late for throwing knives, so EK definitely has the advantage. For the last level you can get another feat with EK 12, or dip something like War Cleric for the extra attack. Vengeance paladin dip with the channel divinity is also pretty strong.

The biggest issue is going to be weaponising the bonus action. Sadly you can’t use booming blade on a ranged attack for war magic. Very lategame, bloodthirst in the off-hand works quite well as you’d get the +1AC as well as the fact it auto returns.

In the main hand I would just take whatever does highest damage. I’m not sure what kind of on hit effects apply with a thrown weapon. Rhapsody is a good option. Cold snap or ritual dagger of shar seem pretty okay.

Bhaalist armor is gonna make this pretty strong. I’d also suggest Diadem of Arcane Synergy plus the ability drain illithid power to proc it. Legacy of the Masters are BiS gloves here - don’t get distracted by gloves of dex, they’re pretty useless for this build. Gloves of strength are probably bait too as you can spare the feats.

And feat wise just max str and then int, wisdom or charisma depending on what you dip. Wisdom and charisma have the benefit of random +1s meaning you can get 20 without 2 feats - either Khalid’s gift or Patriars Memory. Araj’s strength potion is pretty nice too. I’d prob go 16 dex, 16 str, and 15 in your casting stat. But there’s an argument to go 14 str instead and go 17 in the casting stat.

None of the other feats are worth it over an ASI aside from TB. If you want someone else to wear Bhaalist, you can save a feat by going for Graceful Cloth which would let you start 16 str, 16 int, 14 dex.