So, thinking as a customizer who just stocked up on casting supplies, I was looking at my small Megos and I started thinking about the possibilities. It occured to me that Mego could have done a lot more just with what they already had, so here is what I came up with:
Arcturian head on Crew male body.
Betelgeusian head on Crew male and female body.
Megarite head on Crew male and female body.
Zaranite head on Crew male and female body.
Saurian* head on Betelgeusian or Megarite body for a civilian version.
* What they mistakenly called a Rigellian.
So that is 8 new possibilities right there, all with then existing molds.
Think I may have some fun with this...