_"Solution, of course, of course, is for me to learn to totally rig/re-rig my zoo of imported freebies....." _

Clean up the models. Group them to suit. Plop in a suitable donor skeleton in the setup room, adjust, season to taste. Many of the freebie figures that you find on ShareCG, fan art type figures, you can tell that someone created the model as a static mesh, another person took that model and just chucked a donor in there, did minimal as required faffing about with the joint editor and uploaded. The results show of course, but for personal use ok. Usually there's like a list of 2 or 3 people involved with such freebie figures. A modeler and a couple of people who got permission to "Posify" the model. Heck there's people on ShareCG who's whole repertoire is posifying other people's models and tacking their names onto it.

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W10 Pro, HP Envy X360 Laptop, Intel Core i7-10510U, NVIDIA GeForce MX250, Intel UHD, 16 GB DDR4-2400 SDRAM, 1 TB PCIe NVMe M.2 SSD

Mudbox 2022, Adobe PS CC, Poser Pro 11.3, Blender 2.9, Wings3D 2.2.5

My Freestuff and Gallery at ShareCG