One big problem with this concept is that you cannot create a new separate economics whilst living in wider society.

i’ve met people and communities where people did exactly that. They, of course, start by “quitting their shitty jobs” and spending what they were able to put aside on a piece of land away from the gluttonous metropolises. They don’t cut all their ties with the society that’s around them, but they create a network that survives autonomously. They negotiate their “harmless” little space in the greater state controlled territory.