My nagging thought was spot on - when I moved my scripts from the desktop runtime I had them in to (backslashes changed to forward slashes simply to post on this forum) C:/Program Files (x86)/e frontier/Poser 6\Runtime/Python/poserScripts/ it worked perfectly, Mac syntax and all.

This is something I clearly knew 12 years ago as it's in the readme of my first freebie with a PoserPython script* - "2 - Copy the contents of the 'Poser Default Runtime' folder from the downloaded zip file to your DEFAULT runtime (These are the PoserPython scripts, which are called from PZ2/PP2 files - if you have several runtimes, then in order for the calls to work it appears that the PoserPython scripts MUST be in the main runtime, i.e. under your Poser installation)."

*South East Asian Duel (Poses, Prop, Scripts) - still avaiable at ShareCG

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The 3Dcheapskate (also available in DAZ and HiveWire3D flavours) occasionally posts sensible stuff. Usually by accident.
And it usually uses Poser 11, with units set to inches. Except when it's using Poser 6 or PP2014, or when its units are set to PNU.