Yes it's technically possible, but I doubt DAZ will do that - the reason they give their base figures away for free is because they are the engine that drives sales of content, and a lot of that is textures.  Aside from that the V4 uvmap isn't really all that wonderful anyway.  I wouldn't be surprised if they offer some sort of texture converter, maybe a new (non-free) plugin for Universal Texture Converter, but the output from such things takes a fairly serious quality hit.

That doesn't mean a third party couldn't give you a remapped version, although that's a very big project in itself.

My Freebies