You can already copy morphs over without using GenX; just use the transfer tool, but you'll need some external modelling for clean up.

 

Also this post from the person that made the mesh, which explains the changes in G3 and UVs:

 

http://www.daz3d.com/forums/viewreply/845208/ 

Veeeeery enlightening -- thanks! (I still think a converter will get made -- I'll just be increasingly impressed when it is.)