Avenger druids should be effective in late BGEE - once you reach level 7, you get shapeshifting, and I don't think that much in BGI can stand up to a sword spider with player health and THAC0 (albeit lacking strength bonus). Bonus points if you then dual-class to fighter - that's how I'm playing through BGII at the moment (Needed to import from BGI to get the strength required). It's probably not much fun trying to reach level 7 in the first place, of course.

Wizard Slayer should be half-decent in BGI; not so many items you miss out on, and casters tend to be more approachable in melee. Inquisitors are probably still scarier though.

You could try playing a wild mage yourself, for double the arcane insanity and chances to die hilariously.