A modified .cr2 would have other problems I guess.

I think I could modify one of my material creation scripts so that it would add your second skins to an existing shader without breaking it. Such a script could be loaded from the library as a mat pose would. Would you be willing to test this, would you give this a try?

A ship in port is safe; but that is not what ships are built for.
Sail out to sea and do new things.
-"Amazing Grace" Hopper

Avatar image of me done by Chidori.