Combining the simple vein setup "that no other found a better solution until now" it should be possible to combine the skin script to adapt an older skin adding the vein option right into it. but this has to be figured out if in two parts or a single click option would really needs to be done.

BTW: Sample renders have the exact same Ambient light setup and superfly render setting No Postworking on the renders No changed on the maps or skin.