Taking a couple of steps back, I'm particularly interested in the bit Ive highlighted in bold below.

ssgbryan posted at 11:50PM Fri, 17 April 2020 - #4385234

willyb53 posted at 11:58AM Thu, 02 April 2020 - #4385120

A fully loaded V4 with external geometry still will take up 100's of megabytes of memory for each copy

Bill

There are ways around that. I have a base V4 with all morph packs and corrective morph packs - she runs at around 500Mb. I have one of these for each base mesh that I use.

When I make a character, I first strip out all of the unused morphs (1 click). Then I use the "Dials to FBM" command to make a final FBM (1 click). Then I strip out the PBMs that made up the FBM (1 click). Make an injection of the FBM (1 click). Load FBM into a base mesh with only expressions and it is done (1 click).

Now he/she is less than 100Mb. If he/she is a regular character (as opposed to a "red shirt"), I'll put him/her into a uniform (M4 Valiant or V4 Courageous that has been run through the fitting room) merge the figure and then use the Reduce Polygons command to shrink it even further.

It is also a lot faster than it sounds (less than 5 minutes from start to finish) - l love python scrips in Poser

Do you have a list of the specific scripts you use ?

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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.