I went through the process a few weeks ago. It is long and involved. I deleted some of the wrong text in the .cr2 and ended up with invisible parts. Ultimately I replaced the prop body part with another prop. If you put an asterisk (*) in front of the section in the .cr2 which contains the custom geometry, Poser will apparently delete those lines the next time the .cr2 is saved. Easier than selecting and deleting the whole geometry. If you try it, and it works, let us know!

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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.