Could most of this not be achieved by adding a markdown mode to Firefox? Whenever text/markdown content type is received it would display it using a stylesheet set by the user. It could skip cookies, etc in this mode to reduce, if not completely eliminate, tracking.
I'm waiting for folks to look at gemini, see only part of what they want, and make markdown-native web protocol, a wiki protocol, basically. I think that would be very cool, and it is what drew me to gemini before I figured out it was really super-gopher. Like what if there was a mediawiki protocol? You'd have your tables! Anyway, there's no one stopping anybody for trying to make that happen. The true interwiki promised in the days of c2, could actually happen!... if some people want to make it happen.
