Did you consider PineTime?

While the PineTime/Infinitime is an awesome project everyone in our community roots for, the hardware platforms are totally different. The PineTime is microcontroller based and works on just 64KB memory and 512KB flash. AsteroidOS is a linux distro tailored for devices with SoC, half a gig of memory and >2GB storage. Arguably its much smarter on many levels to use the microcontroller approach for the rather simple smartwatch task. But somehow these full SoC general purpose computing smartwatches have been produced and we as linux people slipped into the niche of seizing those.