The issue is the Dryad figure that uses V4's rig.  Remove that from the texture package and I really don't see any reason you couldn't sell it the same as any other texture/character package.

DAZ won't allow you to use even a part of the V4 rig on what can only be considered an original rig.  DAZ went so far as to trademark it's Triax weight map rigging for DS4 and Genesis.  I don't have to deal much with boys and girls in Legal but from what I understand of trademarking, it's no small chunk of change.