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Lineage-23.0-20260119-NIGHTLY-pro1x with January 1st security patch installed smoothly via OTA. MindTheGapps16, and root was maintained. 

Lineage-23.0-20260112-NIGHTLY-pro1x with January 1st security patch installed smoothly via OTA. MindTheGapps16, and root was maintained. 

One more update, with apologies for the triple-post. I received a secondhand original Pro1 in the mail from the indefatigable @Hook. Using the official flashing guide from this thread, I updated the Pro1 to firmware 20200825 and re-ran the initial setup process (including a one-time factory reset). The Pro1 was confirmed to be working normally. However, when I unplugged the original Pro1 screen frame and plugged in my Pro1 X screen frame (with the replacement Elephone screen attached), the Pro1 immediately entered a boot loop. I then went back to the guide and reflashed all the firmware partitions again. The Pro1 booted normally again afterward. I went through the initial setup process again and moved the screen frame back to my Pro1 X. Voilà, a fully working Pro1 X screen with no touch-insensitive borders! I don't know what part of the firmware files did the trick. I'm not even sure they actually changed anything about the screen--it could be the boot loop was completely coincidental. Either way, I have a fully functioning screen again, a few spares, and peace of mind that I can keep this phone working for a while yet. Now that I know this process works, I'll offer this service to others. If you provide me an unflashed replacement screen for your Pro1 X and a paid return label for it, I'll update it and send it back to you for no futher cost. In the meantime, if you have both a Pro1 and and Pro1 X, I hope this information is helpful.

An update to this. My replacement Elephone U Pro screen arrived yesterday, but I didn't have a chance to install it until today. The screen is clearly secondhand; there was exposed, dirty adhesive on the back, and the plastic scratch protector on the front is also scuffed. The screen itself is largely undamaged. It came with several tools to help with replacement, including spudgers, adhesive strips, and two small screwdrivers (one Phillips and one flat). The display frame was very easy to remove per F(x)tec's instructional video. It was a little more difficult to remove the screen from the display frame; I used a hair dryer to loosen the glue in one corner, then slowly pried it off the rest of the way. Then it was a simple matter of adding the new adhesive strips, setting in the new screen, and re-assembling. Unfortunately, there are some black blobs on the corners of the screen, which was what I originally ordered a replacement screen to try take care of. It sounds like that's a common problem with replacement Elephone screens. However, between the time that I ordered the screen and it arrived, I dropped the Pro1 X again and the factory-installed screen failed entirely, so I needed this replacement anyway. I was hoping I wouldn't need to flash this screen to deal with the touch-insensitive margin, but I will need to if I want true edge-to-edge input. As has been mentioned, if I put my finger within the margin and drag all the way to the edge, it works, but starting at the edge does not. To be honest, though, I'm debating if I even want to do it. Curved screens have always annoyed me--I tend to accidentally interact with things with my palm when I don't want to--and all the apps I normally use don't require input at the very edges.

Lineage-23.0-20260105-NIGHTLY-pro1x with December 1st security patch installed smoothly via OTA. MindTheGapps16, and root was maintained.