The good thing is someone has thought of this before. That’s basically the concept of InfernoOS. The bad news is it is defunct and, even if it wasn’t, it was only really used to for network appliances, such as routers, print servers, etc.

Remote access seems to tick most of the boxes for you and it’s quite easy to install and maintain.

This is interesting, but I don’t see how this is related to privacy.

I think it’s more of a trust issue.

It took me going to their GitHub to find out, but it’s GPL 3.