Hmmm... at least in one example the script worked better than it actually looked. The morph I applied was maybe just far too extreme.  I have been morphing posed characters into each other, but Poser does not recalculate the vertex normal vectors as it seems. Therefore, the shadow maps do not really match, and the surface shadowing suggested breaks where actually everything was fine and smooth.  What looked poor in shadowed preview mode looks excellent in hidden line preview. Bah...

But I guess that is an acceptable limit.

Maybe should not give up yet.. weeh.