Wow.  This forum doesn't seem to get a lot of traffic these days....

I don't think I'm going to get any further with this concept unless I achieve some unlikely breakthrough in understanding vector math.  So I'm going to go ahead and post these, so someone else can tinker with the idea if they so desire.

This first script sets up the poseable prop chain.  To use it, create and select a hair room group before running the script.  The script will create a prop chain which can be used with any selected hair group and the second script, assuming the hair group has the same number of vertices per hair as the one which was selected when the props were created.  Run the first script, then pose the chain, then run the second script after re-selecting the hair prop.

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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.