This technique also works with things like Jepe's Jewels and Tears (don't do the culling method suggested in "Refinements" if you want to use a transmapped product). It's a kludgy workaround, but it's free. I may do a video or I may not. I've been ill and my voice is still not at 100% yet. If I do I'll link it here.
This should also work in the reverse direction if you have purchased G3 clones for G2. If you want a V4M4 skin on G3 I recommend you apply that skin to Genesis 2 and use it for this process; the shapes are too different for even clones to work very well.
Here's a proof of concept showing Elite V4 Arianna on RawArt3d's Massi