Must be nice to have your own ~~sheriff's department~~ paramilitary...
I've also seen this video: Starting a Longevity City: Niklas Anzinger and Laurence Ion Introduce Vitalia at EARD 2023
I do think collapsniks should do something similar, building / moving to a small town or village that is designed or can be reshaped to be a sustainable community. And cheap living environment. But it should be mostly apolitical except for a solid democratic socialist infrastructure, practical governance with a focus on sustainable food, water and energy supplies and workshops to repair and maintain everything. I know there are some projects for that, but an alliance with a few rich people to build and finance something like this could be useful - as long as it's community owned (e.g. silent partner / loan or something)