Since theymos would not have control over discord, I doubt that can be implemented. The current process of recovering account here is already secure so there is no need to rock the boat as of now.(In my honest opinion).
Wrong , theymos dosnt recover Accounts anymore or i guess just when its needed.
FYI: The humans handling the new account recoveries system which was implemented late last year are a company that Cyrus created called
Cryptios. alanst, 3dOOm, and Rizzrack -- the "mysterious newbies" who some people noticed -- are three of their employees. They've been doing a great job.
Although Cyrus created the company with bitcointalk.org in mind as their first customer, they are accepting additional customers. Their main specialization right now is high-security, social-engineering-proof customer support & community moderation.
All the Account recovering are done now from cryptios and there team with Cyrus as the leader.
For sure they doing it with the main signed message thing i guess as you have written and it was just a friendly suggestion or asking from me if that would be possible ,
to recover Accounts that have there Discord ID posted here in this thread and are already in the Bitcointalk Discord Server if there would be something with the Account.