I might volunteer to help out - if I can find some time to do so. As mentioned elsewhere, we federated WordPress very successfully into an earlier version of the fediverse (before ActivityPub was a thing;  and long before Mastodon) so I've already been through most of the issues. Heck we federated Facebook into the fediverse  -- before they found out and pulled the plug. ActivityPub and Mastodon both threw a couple of spanners in the works, but nothing we haven't solved before.