id just do a no KoTR because thats the reason everyone says the game is dead easy. if there wasnt omnislash and KoTR, people would actually find the last boss at least slightly challenging.

a no KoTR rule seems all you need. i dont see any reason to outlaw other summons. good luck with this challenge. kitten sith doesn't get all of the attention he deserves. hes an interesting character.