@[email protected] @unconed Yeah, protocol compatibility is a sucky problem.
A brief look at the OStatus protocol makes it look like forwarding, at least, would be reasonably easy.
Also, it seems that conformant (hah!) implementations should ignore extensions, so this *is* something you could just implement in Mastodon, the software, and it'd work for all Mastodon instances (plus others, as they update for the clearly awesome feature).
No ocean-boiling required!