"not ideal for Carrara" is putting it mildly.  Looks like a giant PITA to me, knowing the uv issues of geografts in Carrara.  I would be tempted to do a Figure Merge inside DS using the Geometry Editor and reassigning the grafted geometry to their proper Regions.  Assuming that that works,  and transferring all the effected morphs, and then Adjusting the Rigging to Shape,  etc.  One might end up with a G9 with G8/8.1 uv's in Carrara.  

I know nothing about Ultimate Unwrap 3D Repaint so I can't comment on that option.