Well not necessarily model a brand new Kyle head. You would just need to copy them and paste them with your new model (somehow I'm not a modeller) and have part of your model_default file look something like this:
The "2" being whatever extension your imported skin file is. I would look at the modelling forum to see how you can "swap" heads on characters. And tell me how, I think a Jawa Jaden would be awesome.