I am indeed going for the cheese on this one. Checking the EXP chart, I see that I can wait until Level 25 to Dual--that's a long wait, but 6 Warrior HLAs might be worth it. It would even be worthwhile to create a Wizard Slayer Dualed at Level 2--screw the Magic Resistance, but you've got your Spellcasting Failure on hit for the rest of the game.

(I'm also roleplaying an interesting alignment: Rozen started out LG, but now that his soul has been stolen, leaving him open to the murderous taint of Bhaal within, his actions are becoming CN, soon to plummet to the depths of NE.)

Personally, I think Wizard Slayers should be barred from all magic Rings, Amulets, Cloaks, etc., EXCEPT those that grant Magic Resistance. Or something.