For IndieWebCamp Berlin 2 2019, I built this proof of concept feature in the WordPress Admin. It does actually work, but the functionality that enables the posting needs a lot more backend work before it will work properly.
Problem is that the WordPress post endpoint does not allow you to set a taxonomy during post creation, so I need a custom endpoint. If I need one, it needs to be a bit more fleshed out so I can use it.
I considered modifying the Micropub endpoint to accept local queries and sending everything in Micropub, but a custom endpoint seems simpler for what is being done.