ok, i know nothing about poser python, but...

this sounds a lot like what wardrobe wizard does, to some extent.  and you're saying that the problem is organizing the data while doing the comparison.  well, why can't they be user separated?  with ww, you have to analyze something before you can try to fit it.  doing so creates a .dat file with all the appropriate info.  if you try to conver something that hasn't been analyzed first, you get told to do so.  if you have analyzed it, you just convert.  analysis can take a from a seconds to several minutes (and seems to need poser to be active).  conversion is pretty quick. 

i would think that if ww could convert between the kiki and apollo (i believe that was the promo image when apollo was added), that morphs between humanoid figures wouldn't be impossible.  another fitting script seems ubiquitous.   i mean, it might be nice to have something where new figures didn't need to be added by the creator, but since it wouldn't work between figures, it  would be kind of moot (most minor figures don't have many morphs).