I was disappointed to realize only after buying the add-on that it wouldn't do that transformation, since I bought it on impulse upon noticing that Eddie is just the skin I've been looking for for a beloved M4 character. (Not going to try to return it because if I'd actually read it, it says clearly what it is, and I don't want to be that person.) About the Genesis 3 maps...I'm copying and pasting this from a product description for the M4 UV's for Genesis 3 male:

"The UV maps for Genesis 3 figures use a UV mapping protocol called UDIM (U-Dimensional) and now divide the surfaces differently from preceding generations of DAZ figures. This means that some surfaces of Genesis 3 figures cannot use all the corresponding textures of previous generations because a surface cannot utilize more than one UV map.

However, if these surfaces are given a second skin in the form of geografts then the geografts can use their own independent UV maps to access the textures. Usually geografts are used to make geometric additions to an object, but in this case they serve only as surfaces to display seamlessly the otherwise unavailable textures."

That's all like a foreign language to me, I don't understand the explanation for why the maps can't be made to cover the figure, so I don't know whether or not it would also be a problem when trying to do it in Blacksmith.

Interested in hearing more.