Just a quick note on the "boil and pop" method for head swapping kubricks. I've done a few x-wing pilots using Jedi luke and ceremonial luke.
What I do is get a small saucepan of water boiling, and using a metal tong, hold the kubrick by the feet dipping the head in the water. I hold it for maybe 45 seconds to a minute, and that gets the adhesive for the neck peg nice and goopy. Then I use a blunt item like a popsicle stick or butter knife back to gently pry the head away from the shoulders.
I might have to look into some other generic humans from other kubrick lines to make into extra pilots-