You can simply edit a V4 cr2 so it points to one of the V4 LOD objects.

The original morphs of course will be useless then, but most can be re-transfered back inside Poser. (Provided you have PP 2014 or Poser 11)

As I disliked V4's original rigging, I deleted all the magnets and JCM's, and simply weightmapped my V4 LOD's from scratch.

Here's my weightmapped V4 17k LOD:

And here are some full bodymorphs I transfered over from regular V4:

Finally a custom morph sculpted after the original Stephanie Petite figure:

The process is pretty much identical to what I did with the M4 LOD meshes here:

https://www.renderosity.com/mod/forumpro/thread/print/?thread_id=2874173

These LOD's are of course easier to weightmap than the higher resolution figures, and thanks to the sub-D Morphbrush functionality included in Poser 11, can be just as detailed as the original ones.