Look at kawecki's Filelocker if he still have his morpher online. This tool can repair the vert count by comparing the morphed file with the original one, IIRC.

Not sure it's still there. Hope he makes a new and imporoved one. This is the only way I ever re-imported a FBM successfully in and out of the Poser window without the vertex error (until now 2011). The downside of merging your morphed figure with an unmorphed figure is that you only get 50% of your morph. I mean, if you mix black and white, you only get grey. The chances of messing up fingers and toes increases if you export out of Posers window, also.

The safest way is to import object from geometries to UVmapper. Export a copy of UVs*.* Then Morph and resave. Import UVs and resave. This can then be brought in using "Create FBM or some other 3rd party py script .