Requires OG Pebble parts, but this may be a good fix.
I found this just now, I have two P2HRs that both need new buttons, but I think this may be an easier fix. https://tinyurl.com/k8a5h6na UPDATE (08/05/2021) I bought the version with the battery and glue. It’s a fairly easy transfer. Requires a Soldering Iron and some steady hands, but the fix was worth it! Don’t forget to transfer the microphone seal from your old case to the new one, and use A LOT of glue to get the back sealed back up!