Lol. The unexpected keyboard had a release commit 8h ago :D
Try Carnet it is exactly what Google Keep does but a nextcloud hosted App with mobile apps.
Sorry, maybe I am too deep in the software jungle but what is the painful learning process? No front, I am genuinely curious.
I setup k9 a few years back and thought it comprehensible. The only thing I remember a bit annoying was migrating GPG keys over.
The backend capabilities are there. The front end for the Web view must be enabled by the admin and the mobile apps currently lack the feature.
Eternity. I was using infinity for years for reddead and having an in-situ replacement is nice.