Hello everybody I know this thread is long stale but I was inspired by it alongside some other community contributions when I was drafting a new proposed ERC (7611) that allows NFTs to be migrated across rollup platforms in a way that does not cede sovereignty to an external interoperability network.
I wanted to post here in case anybody is still actively thinking about this problem in the event that you would be interested in reviewing my proposal and giving me feedback on how I can improve it.
You can find it on the Ethereum Magicians forum under the title “ERC-7611: Sovereign Bridged NFTs” (can’t link directly on this forum)