Hm, no.

Studio has an object exporter that lets you export a welded and/or scaled copy of the mesh.
I actually don't know if that copy has the exact same vertex order as the unwelded original. (I doubt it)

But it doesn't matter, because MLP can take that copy as a whole and translate it back into a useable full body morph for you with basically a single mouseclick.

It "memorises" the original vertex count and order and just restores it to split the welded mesh back into the standard grouped poser mesh.
It then uses that re-split mesh to create morphs for you.

It also "memorises" joint deformations.
If you posed the mesh before exporting, save the pose, then "feed" MLP the pose tile and it will subtract the deformations from the new morphs you did.

Great little tool. Really wouldn't know how to work without it anymore.