The trick is going to be asking the vendors to learn yet another process: weight mapping. I promise I don't have a clue as to how to do it, even to edit a weightmap. As to having the vendor run the item through the converter, why ask him to do that when it can just as easily be done at the user end and not inflict (yet more) code bloat into downloads.

I guess my own issue here is, I've never converted an item that didn't actually fit V4WM BETTER than the original fit V4. But that's just been my experience.