After toying with Ulco's .tgd for a few hours, it appears I can get the results I was after, but I can't help but be curious of what the Simple Shape Shader does.  So here are three renders: first with the SSS untouched - you can see a sharp line of color displacement mismatching. Second: SSS disabled.  Third: SSS disabled and my color shader setup plugged in where the "test" PF was.  I'll probably be staying with the SSS off.