It would be possible to make a V3 version, though it would require a bit of time in the setup room and I don't think you could redistribute it since it would basically be a hack of the V3 obj file.  

First you'd have to export all of V3 to an obj file, then you'd need to export a second object file for the right and left arms, hands, fingers... etc from the original obj file for V3.

You'd need to import both obj files back in, reposition the additional arms to where you wanted them, then use the setup room to add back in V3's original skeleton and add additional bones for the new arms, hands and fingers.

It could be done, but it would take a bit of time and I don't think you could redistribute the end result as the object file.would primarly be V3 with some additional bits hacked in.

Barring that you could also just export the arms, hands and fingers and make a new figure out of that, but again you'd need to do some hacking to get them to conform to the V3 figure in the proper position and move with her when you moved her.  Again possible to do, but somewhat time consuming and not something you could redistribute.