Arg... one final hurdle, it seems.  I'm getting an error message in Mimic that "the OBJ has polygons referencing multiple groups and so may not work in Mimic"
Well, there's no maybe about it, it doesn't work. 
Another curious thing I noticed is that the Cr2 of the neutral head is 631 kb in size, while the Cr2 of the head with morphs is only 86 kb in size.  THAT makes no sense to me at all.
Yet, they load and work as expected from the Poser library.