Old tropes? Lol
Orcs and Humans are the beating hearts of their respective factions. You'll need more than just a different skin color to pretend that giving Orcs to the Alliance isn't going to fuck faction identity over.
If you do want change so badly, no matter how legitimately shitty it can be, then go for and demand the dismantling of factions; the moment faction identity will matter jackshit you'll not even have to care about putting races into factions in the first place.