Thank you for your prompt reply, both of you! Please put this next question down to totally newbie-dom... I feel I'm so close. It's a matter of my interpreting your instructions correctly, which I have re-read and re-read and cross-read and re-read and here's what I came up with:

I'm going to have to speak in lay terms, which means excess verbiage, since I'm still very, very green at this. In your new shader, Bill, I used to have the PM: Shine Value_1 plugged into an Add(.25,1) of which Value_2 was plugged into my Lips_Mask node. Alongside that, I had the PCM:Color_Tint plugged into a Blender node(WHITE,MAUVE,.4) of which blending was plugged into the lips mask.

Monterey/Mint21.x/Win10 - Blender3.x - PP11.3(cm) - Musescore3.6.2

Wir sind gewohnt, daß die Menschen verhöhnen was sie nicht verstehen
[it is clear that humans have contempt for that which they do not understand] 

Metaphor of Chooks