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The migration is almost done, at least the rest should happen in the background. There are still a few technical difference between the old cluster and the new ones, and they are summarized in this issue. Please pay attention to the TL:DR at the end of the comment.
Tried to get it to work on Windows, didn't quite succeed (crash in glfw really early, think maybe a driver issue), but I did fix a bunch of warnings-as-errors in MSVC and other related things.
Thanks for porting this to OpenXR btw!