Sounds fitting to me!
My understanding of the Nomad is that they're not really tied down to Earth in particular, as cemented by the fact that instead of a "retire from the life or become a paragon" advancement, they just get "Depart for reaches unknown, never to return." Of course, the point of The Nomad seems to be to find reasons to stay. So, sounds good so far, but let me know about the specifics when they develop.