Discussions are happening on tor-dev@ so once the dust as settled, I propose we put this one in merge_ready (once you are satisfied teor) so we can add it to tor-spec.git.
Proposal doesn't need to be perfect, just in a state that implementation can possibly start.
Add all the tickets from sponsor 55 that are done and being worked on to the keyword #network-team-roadmap-2020Q1 so I can look at them in the wiki page...