Interesting idea, but unfortunately, I do not think that it fits with the vanilla Original Sin campaign, simply because combat is far too integral. You're proposing the existence of seven different skills competing for ability points.
Just noticed a little error. I actually meant abilities :O I always mix up abilities and skills in divinity.
It's basically inspired by old school ultima online/later mmo. I just suggested it because I want to play a mage with alchemy/potions and found it weird to also make bows and boots.
But of course it's not important, just a thought.
