I love projects like this. I've considered getting a smartwatch. Something like this makes the idea more appealing. Whats the most hackable watch? Is there a pinephone of smartwatches?
It isn't that powerful, and I wish it had a second physical button. I haven't explored the mods very much because it does what I need it to do, but the scene has the feel of the early Xbox hacking scene, to me at least.
There's this watch which appears to be heavily inspired from the Amazfit Bip: https://www.kickstarter.com/projects/gfw/banglejs-2-the-open...