You’re right that it doesn’t exist. I’ve been searching for a pebble time replacement since Fitbit bought Pebble and squashed it. The Google acquisition was the icing on the cake. You can still buy a Pebble time, or a HR2, but they never made the pebble time 2 (with heart rate) that would have been the dream device.
I have finally settled on the Garmin Forerunnier 255. Do I trust Garmin’s data handling practices more than Fitbit/Google? Yes. Should I? Probably not. Regardless, Garmins don’t have a reputation for breaking like Fitbits do. Garmin feels much closer to a Pebble in terms of customization and data accessibility. It has a color e-ink screen (this was huge for me) and buttons instead of a touch screen, which means a 7-10 battery life even with an onboard GPS. It allows for some open app development but is not open source. It’s definitely less like a smart watch and more like a tracker with notifications. Ive had it for about 6 months now and it’s the first device I’ve been happy with since pebble.