Oh! Wil! Great work! Clever idea too!
I do use Unwrap to touch up the linearity, mainly for vertical match of my cloth products.
As i mostly use planar mapping, rather than pelt, it is only needed to stretch by relaxing a little bit, then work with the UVW vertex to correct both maps in perfect match.
As you say, I did not understand if you applied new coordinates. I suppose so, because the default skin coordinates in RL system are really strange and difficult. Worse if used to do the marvelous work you did here.
Let me tell you are a great Digital Artist indeed!
I always admire the exquisite detail and shape in all you works.
Mike
Mike Aparicio-Reallusion Certified Innovative Content Developer