You'll have to delete all the bones that aren't needed and will be left over in that case. Select bone, press delete. Let me know if you run into any problems, which you may... I'll try to sort it out for you. That's alot of bones to delete, and I'm not certain of the results until I sit down and test it. Everything should work as expected, but Poser can get strange when dealing with multiple figures and extreme rig modifications.

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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