Always appreciate research and testing to push the limits. I have been personally manually keying my own footage on the greenscreen videos so far with excellent success. Even though my pimax headset does not have passthrough, I am using some old footage from when I still owned a K2 pro and it matches scale perfectly with your scenes. I am able to greenscreen my own custom backgrounds and the resolution is as good as the main video, something I doubt any headset with cameras will be able to match for several more years.
One quick question with this update. Will these changes remove greenscreen moving forward and will these updated scenes still allow us to key out the background on premiere?