Extracting the werewolf fur shading overlay?

I've seen a couple threads about the nose/pawpad skin parts, but I haven't been able to find anything on working with the fur texture on the paint-able parts. I'm working on a set of digitigrade paw default replacers that really need their own texture to go with (and I'd like to keep them paintable, if at all possible). Skininator doesn't work because they seem to use the pet fur overlay system instead of skintones, and I haven't been able to find an alternate tool/any means of extracting them through S4S.