I sketched out two methods earlier today for someone in the comments on another post: https://boffosocko.com/2022/04/25/55804148/#comment-374484

Another method might be to use PESOS and post to Mastodon directly and use something like IFTTT to reverse syndicate to your site, though this would make it harder to backfeed replies from Brid.gy. See: https://boffosocko.com/2020/01/21/using-ifttt-to-syndicate-pesos-content-from-social-services-to-wordpress-using-micropub/