This is my take for the replacement button of my beloved pebble 2 hr which rubber button starts disintegrating since thanos start to flick his fingers.

need some polishing since it has very small details but with proper printer settings it shouldn't be very hard.

you can add silicon base adhesive before mounting the button on the cover then cover assembly to the pebble 2 main chassis. this is to trick your own mind into thinking that it will be water proof again. but feel free to skip this step if you want to.