Nope, unless you're prepared to wait a couple of years for a fully functional version of
GemRB to be released.
In the mean time, if you want higher resolution but you don't want the new BG2 classes, the answer would seem simple: don't use them!
After all, it's not as if the game forces you to be a barbarian, monk, or sorcerer, or to select a kit. Your PC can still be a plain old regular fighter, cleric, mage, etc if you want him or her to be, and changes to NPC classes and kits are entirely optional.
Heck, you can even bring back the BG1 GUI, the BG1 weapon proficiencies, etc if you want a truly authentic experience.