Humans and Vaylen as Aliens

So I had the notion during world burning for a plague or chemically-wracked world where the survivors, both humans and/or vaylen count as a native life faction. The humans might still be infectious or are somehow shunned by the incoming population and the Vaylen could be recently hulled but abandoned so have no concept of vaylen culture. So my questions would be: a)does this sound workable and b)can the ALF Burner be used to make humans and non-clan vaylen?

The Trait burner probably works best for modified humans and sentient-aliens. Then you can just add these traits during char burning to define the character.

Just a thought.