Possibility of custom roms /firmware in the chinese smartwatch market?

Greetings fellow android watch enthusiasts.

I have come to query one of the best watch communities I have found so far on the topic.

Is there any android smartwatches that has custom open source firmware/ roms?

  1. If it can be rooted then , a custom rom can be potentially made?

  2. Are there any brands that seem to have decent quality control on the parts?(more of a personal experience question)

  3. From speaking with a friend , he explained to me that the issue you can potentially run into , is the drivers specifically designed for a certain kernel like “android 7” and when trying to make a new OS port.
    Is the fact that those drivers would have to be re implemented entirely.

Any resources would be greatly appreciated on.