JTL It probably could be done, just need to identify equipment needed and who might have it. Clearly those off the shelve flicker tests are not good enough, as on youtube macbook air m2 is flicker free totally. Only then other way is to use higher than 240fps video recorder with micro lens. This is one type of equipment, https://www.phantomhighspeed.com/products/cameras/tmx/7510, but it lacks micro lense. I am wondering maybe chemistry faculties record micro chemical reactions with some special equipment.
This is actually probably most relevant,
https://slowmo.co.uk/applications/high-speed-macro-imaging/
But they are based in UK, which is not where I am based. For someone it would be possible to hire the equipment and do the test. I bet most people in this forum would happily crowd fund the project.