Brilliant idea, General! Love the way you are thinking. I'm hoping some of the forum moderators are also reading this - someone who knows a bit more about the legal side of sharing stuff and what is and what isn't cool to share.

You came up with some concepts that I hadn't even considered: alternate transparency maps, improved displacement maps, perhaps HDRI-based IBL lighting, who knows? There's heaps we could do (and share) without edging towards copyright issues. And, I suppose if I create a texture (colourMap) file of my own and add GC to it, I can do with it as I please. It's just using the original textureMap that might be dicey...

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