gnome-blog, version 0.8 has support for WordPress blogs. However, it seems that selecting wordpress appends “wordpress/xmlrpc.php” to the URL. This results in silent failures if you enter, for example: https://coderich.net I ended up choosing Self-run Other, then entered https://coderich.net/xmlrpc.php as the URL, and everything works. Yay!
Update: Apparently gnome-blog doesn’t set the title properly with BloggerAPI. I switched to MetaWeblog in the options and now it works!