"I wish spawning a single character FBM from dialed characters and deleting the source and unused channels was a basic feature of Poser!"

Scripts-->WardrobeWizzardMenu-->Utilities-->Morphs-->Dials to Single Morph-->Select name-->OK  

Your morphs are now a single FBM

Then:

Zero All Morphs

Then:

Download and install Ockhams "Clean unused Morphs" python.

Run it.

All morphs are gone except the FBM you just created.