Honestly? This thread makes MUCH MORE FUCKING SENSE than regular current mutators.
You get to customize your xeno without having raw stat buffs that removes huge ass balance. This would be the equivalent of attachies for xenos.
New features that are only usable once per xeno life would allow a multiple new amount of ways to play xeno and that would be not only funnier, but that would also benefit the whole gameplay removing our raw stat buffs.