I recall something like this, what did you call this? ipv8?

the thing is that it does require a switch similar to ipv6. but maybe there’s a subnet that maps 1 to 1 with the legacy block?

something like this could theoretically be pinned onto ipv6 AND anyone could do it, just select a 98 bit prefix you own, and the rest of the 32 bits you can map to ipv4.

phase -1 could be tunneling traffic through a single zone proxy which would be inefficient and is purely conceptual

phase 0 would be the same, but with an anycast ipv6,same ip that resolves differently based on location, like 8.8.8.8

phase 1 would be the mapping prefix to ipv4 (and viceversa?) being distributed to the routing tables like, which could be done via application logic (most efficient), or via some deep arcane isp routing conf files, or just a hell of a lot of routing table entries for each ipv4 but duplicated, possibly programatically controlled by an application that generates router table files as a target, thus avoiding desyncs and effectively becoming the first option of application level implementation

maybe something like this already exists though

of course it’s horrible hacking (as hacking in the non crime sense often is), but it allows for a purely technical solution to issues of political and administrative nature.. which is all the rage nowadays