Thanks for the tip.
I'm not going to mess with the heads, just going to stick with the vanilla KOTOR heads for now. At most, I'm only working on the parts from the neck down (depending on the armor model). I was only planning to do like a test run for something like adding/replacing custom armors. See how it would look like in the game, if the KOTOR animations mesh well, etc. Then, see where it goes from there.