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@Graycot Regarding FLOSS smartwatches, what do you think of the PineTime from @PINE64? You might be interested in having a look at the wiki.

https://www.pine64.org/pinetime/

https://wiki.pine64.org/wiki/PineTime#Datasheets,_Schematics_and_Certifications

BangleJS seems to be a similar project.

https://banglejs.com/

A more DIY approach might be Open SmartWatch (as in print your PCB and case).

https://open-smartwatch.github.io/

https://www.makerfabs.com/open-smartwatch.html

Related is AsteroidOS, which runs on proprietary hardware.

https://asteroidos.org/wiki/porting-status/