That is very much the idea. as in move away from github issues and keep the discussions here. Its more about manual syncs and the value there is with an RFC sitting in github before its accepted if its replicated elsewhere. We could say get the rfc raised in the forum until its accepted and move it to github once accepted for example and keep it all here till then.
RFCs also mutate while in the same state, that was what I meant with updates more than switching discussions from proposed to active …
To prevent sync issues, yep a travis script via a merge trigger using the discourse gem to post updates via a bot id would be decent to satisfy the requirement and keep the sync issues out if needed. Anything that doesn’t involve manual keep in sync would get my vote 
Edit: script ofc also handling inline local resources from the rfc folder too ofc like other md files or image resources … 