Got it working without Rosetta, I was using usdpython version 0.63 which was compiled on older Mac OS (before Monterey) and this relied on python2 which is no longer on Monterey. I tried getting python2 back but this seemed impossible. version 0.65 of usdpython worked for me instead. But I realized this may not even be necessary for my purposes since Blender now exports the .usdc binary. usdc shows the animation correctly in quickview, so should this work in a Metal implemented project? If so, what is usdpython useful for?