Oh, no.... the texture projection could not really be anything more than a visualization tool, perhaps solely within this face-shaping script itself.  The process is working with 600 x 600 pixel reference images and producing a 256 x 256 texture on the heads.  No, no.  This is not a texture making tool!  Yikes.

I don't know about "replacing" the fitting room.  "Augmenting", perhaps?  As seen here, a, what?  5500?  polygon head can be shaped into a decent approximation of a resemblance using less than 150 marker points.  After that, mesh cleanup may be needed, and the finer details of a portrait will need to be approached with more precise tools.  The same would be true, if this sort of approach were applied to garments.  It could provide a nice starting point, maybe help you jump into the process in the middle, instead of at the agonizing start.  Like that.

The answer is 6487 vertices.

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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.