Increasing joint count on ES3_1

Hi! I could use some help. I’m on a project that uses feature level ES3_1, and I need to know if there’s any way to easily bump up the dismal joint limit of 75. It’s a project for VR headsets, not for phone hardware from 2014, so that limit is a serious issue.

I have been directed to this answer, but the Github link is no longer working:

Apparently ES3_1 is supposed to have a limit of 256, so why is it 75?