I usually spawn a morph of the final simulated shape on the cloth object, set that at 1.0 for the new first frame, and use that as the basis for the final animation of the cloth.  The morph will then need to be deactivated after the new cloth sim is run.  It's worked tolerably well for me, so far.

It would be lovely if Poser gave us a way to handle this sort of thing more readily and easily, though.

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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.