Visit the PoserTech forum at EGroups. There is a head-switching string being thrown around there which may help. It involves a .cr2 hack, and might allow a figure to be loaded with both your head and the standard model.... Don't know for certain that it will weld the geometry. A good question for JeffH.

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Cage can be an opinionated jerk who posts without thinking.  He apologizes for this.  He's honestly not trying to be a turkeyhead.

Cage had some freebies, compatible with Poser 11 and below.  His Python scripts were saved at archive.org, along with the rest of the Morphography site, where they were hosted.