That last thing is in progress now, and will hopefully be done enough to be useful this weekend.
So!
It would be nice to have a few people who could help to do some interoperability testing, and generally shake things out. Possibly as soon as next week. Preferably, you would be comfortable running a server and a database, and doing testing, troubleshooting, and things like that.
If that sounds like you, and you want to help out with a new fedi backend, hmu
And if this is the first you're hearing about any of this, then you may be interested in https://letterbook.com