Following what you do here. Appreciate this as a start. Trying to figure out whether what is optimal is a local WordPress tool that does this, like you have started... or something that can take and repost an RSS. Are you seeing examples of using your plugin that feel like, "Yes! That's why I did it!" yet?
I'm building a WordPress plugin that is a small nostr client that allows sending WordPress content to Nostr from within the WP post editor. First public release on Github: https://github.com/pjv/wp-nostr.
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Well... there are definitely a few people using it and giving me feedback which is helping me fix bugs. But mainly in answer to your question, yeah, I'm using it for exactly the reason that I built it - to send out announcements of WordPress posts to nostr.
I think building more general purpose tools that would take an RSS feed as an input and generate nostr posts as an output is also a great idea. Not exactly what I wanted, so I built nostrtium to scratch my own itch.