This proposal should be cross-posted to EthResearch if it hasn’t been already, the folks over in the research community would be able to provide additional insight and better feedback.
While I can’t comment very usefully on your proposal, in terms of classification under EIP-1 it would likely be “Informational”. There is no process to come to consensus about the greater direction of “Ethereum”, only separate, localized ways for stakeholders to come to consensus on Eth1, Eth1.x, Eth2, each sidechain and L2.
This is recently illustrated in the submission of EIP-2982 / Eth2 Phase 0 specification. This underwent years of R&D, prototyping, testing, etc. and then was not classified (and could not be classified) as a Core EIP, and will instead be submitted as an Informational EIP.