Mike - that's a good idea, but I'm not in an adventurous mood right now. I've added paint to Renaissance heads and thinned down Fiberskyn heads before, but this time I just want a slightly thicker frosted top head and be done with it. :-)
Mark - thanks, but I actually have a one of those Skin Tone heads and it's quite different. More like Fiberskyn with less goo on top.
The Huber heads and contacting Eric Sullivan are good tips, thanks!