Code for #deltatauri is now public!
For now it contains only the most basic functionality - so more for the fellow developers to try out or/and review my code . That being said, it is already surprisingly usable.
https://github.com/deltachat/deltachat-desktop/pull/4462
Thanks to #nlnet & #ngi0_entrust for funding this project: https://nlnet.nl/project/DeltaTauri/.