Thanks so much for your interest.If you take a look at the Android ClockSkin watchfaces section in my site/blog, you'll see the chinese smartwatches with Full Android OS offers very good "skin/watchface" customization posibilities. I even have in the "Articles/Reviews" section a unboxing and review of the Kospet Prime SE (in text version and in video version, in different languages) so you can see how this kind of watches are.
The brands like Huawei, Xiaomi, etc, has their own formats for the watchfaces, but are customizable too. And the watches with Android Wear/WearOS. But sometimes you have to install an app like WatchMaker or Facer to be able to use the watchfaces.
In my case I have an old watch with Full Android, the Lemfo LEM5. Lemfo and Kospet are the brands that currently are offering the best watches with Full Android OS, in my opinion.
Your blog is very good.
Full android watch are very expensive in my country.
If I order from China i will pay cutom tax almost %50. Also Dollar is very expensive in my country
So i need to find affordable models that can be install Vxp themes.