UPDATE: While tinkering around, I made a discovery that, while frustrating in its own right, might point us in the direction of the problem's root cause.  Apparently, the pose that creates most the desired morph dependencies arbitrarily remove a few default dependencies (mainly, the Eyeballs section of Morphs++).  In other words, after loading the custom-enslavement PZ2, the eyeball morphs on the Head have no effect whatsoever because their enslavement of the corresponding morphs on each Eye is canceled.  Earlier, I encountered the exact same problem with the ChestSize Morphform, but I thought at the time it was just an isolated, quirky result of me trying to enslave a scaling parameter rather than a normal morph target.  This latest discovery is disturbing for two reasons: 1)   according to the prefixes used in the internal names for the Eyeball morphs, they're not scaling parameters but true morph targets;   2)  the custom-enslavement pose leaves all of the Eyeball morphs completely alone!

Once again, the system appears to be doing something I never told it to.  Does anyone know an ERC code command that basically says "APPEND BUT DO NOT OVERWRITE"?