@crowgirl I haven't read all the comments here or on Reddit, and the focus is clearly on lvm issues which I can't comment on, but here are some thoughts:

- Is the nvme device removable? (I presume so, but who knows.) If so, you might consider removing it until you get your computer back up and running with no risk of the install process messing up the nvme drive.

The following seem to me less likely to be relevant, but I thought I'd mention them.

- Also, you can get m.2 nvme enclosures from ugreen on Amazon for not too much money that with allow you to plug in the drive via usb at up to 10Gb/s. I mention this because it would avoid having to open up your machine to install the nvme drive during the recovery process, so just a but less messing around.

- I suggest making a full block level copy of the nvme drive that way if something goes wrong during recovery you should be able to recreate it and try again. The nvme enclosure mentioned above could make that slightly more convenient.