> How would you design a system that simultaneously achieved all these goals:

There is an obvious solution that achieves all of these, that, on 1000 year timescales, seems inevitable: deprecation of the nation-state.

The internet solves every problem the nation-state purports to. For example, the very real problem of coordination, eloquently and convincingly outlined in the federalist papers (tldr: we need a central republic structure because it's too difficult to coordinate disparate statehouses via horseback with every little intrastate decision) is solved by dint of instant communication and long-term data retention. So it is with every other claim in favor of these huge legacy state structures.

In this age, there is no longer any state needs to be larger than say, 1500 square km - about the size of a large county. This way, people can flee on foot to an adjacent state if needed, and no state can possibly control enough infrastructure to force Vodaphone to send such nauseating propaganda.

We need the elder statesmen in the room to read the writing on the wall and begin this process.