We still have a few Pebbles which we run using the great Rebble initiative - and there's the option of sideloading APKs, however it's going to be interesting to see if this Play store issue can be resolved. Thread says the dead @pebble.com email was the trigger for the take down.
Presently dead:
https://play.google.com/store/apps/details?id=com.getpebble....