Yeah I know about all those, but unless they're someone that's privacy oriented, most people end up using closed oem solutions. It's kinda weird how some people will get angry at people not using full open Linux, and then go and login to their ring account to check their door if the notification for their Amazon package is correct. I didn't want to say it was a niche in my post but it is, so I wanted to expand that.
I'll crack anything open to solder some jumpers to the rom(or more likely the existing open pin placements where they flash at the factory) and poke around or just fully flash hardware. Where are the other people that do this? It's both hardware and software skilled. Lots of software people, lots of hardwares people. There should be a community to connect and build FOSS systems.