I'm playing a Xenoarcheologist Operative in the Dead Suns AP (currently around Book 2) and I'm having a blast.
I think a lot of classes can fit in the theme rather easily (still scratching my head at a Xenoarchelogist Soldier though). I'd first look at classes that either have a lot of skill points to go around or are scientifically/mechanically inclined - so Technomancer is probably a nice addition to your party.
Synergising your class specialties and the theme is really great from a roleplay point of view, in my opinion. So having a species that also contributes to the archeologist feel is a nice way to go.