A couple of promising projects we've found so far:
Postr for Nostr:
https://wordpress.org/plugins/postr-for-nostr/Nostr for WordPress:
https://github.com/danieljwonder/nostr-for-wpNostritum for WordPress:
https://github.com/pjv/nostrtiumOut of the three, Nostr for WordPress seems to be the only one that openly states supporting posting kind 30023 from WordPress. Nostritum seemingly never got around to implementing long-form text, and it's hard to tell whether Postr for Nostr actually supports it.