Another idea is to have a caves outpost that is staffed by beat-up 0b10 derelicts. The progs ran around fighting derelicts and ordered the ones that lived long enough to be assimilated to go fill in at an empty outpost. If you wanted to be evil you could have the Unaware derelicts move around like normal derelicts in an outpost do to fool players using sensors/seismic, but I don't know if progs are smart enough for that level of planning.