With all these requirements that skills must be optional, feats must be optional, lore must be optional, one way out to scrap the genetically superior humans, is to just remove all mechanical benefits to races.
Wanna play an elf? Fine you're an elf, but you get no benefit. You're exactly the same as a human.
Then design a bunch of "racial traits" that give you something to make you feel more elven, but instead of having them automatically at 1st level, you can get a racial trait in place of an ability score increase. Let's not call them "racial feats" so that people who hate feats-whatever-they-are, are not going to protest, because a group can have both feats and racial traits, another can have only the first or the second, another can choose to have none and go with ability boosts... While we're at it, let's put skills into the same fray...