Hm, if you're willing to compromise on that janky text editor, there's still Jekyll, Hugo and all the other static site generators. Most will have some easy WP site import.
Bear in mind, I don't pretend to be a cool kid...
For a solution that's entirely online (ie. you aren't relying on a bunch of files on your local machine that you generate a site out of and upload), there are flat file websites like Grav, Bludit and Yellow. They are (usually PHP) sites that run without a traditional database.
There are also a couple of ActivityPub alternatives, but they seem to be floundering(?) Plume is currently not developed actively, and I just heard on here the other day that WriteFreely doesn't federate properly for some users. Take the latter with a grain of salt, though.
Oh, and Ghost just added ActivityPub, so there's one more to that list!