Those all sound like a good set of options indeed. I’m kinda hoping to be able to use silicone glue, but any which way, I’ll be testing on sample cards first before applying anything to the board.

Unfortunately, even if I find the metal trace it connects to, the very end of the carbon trace is a dead end, it functions as one side of the rubber plunger button contact pad. So the fix has to be carbon trace friendly, soldering simply isn’t an option here.

Thanks for the thoughts and advice 👍