Sony Xperias have 3.5mm jacks again. A few of them are also supported by LineageOS and Sailfish OS, so you're not necessarily stuck in the Google ecosystem.
There are more features planned. Once it's feature-complete, it will even have adblocking and KeePassXC integration.
However, as I am a student with a few mental health issues, development is slow. I don't expect the browser to be "finished" for another year at least.
For you, I'd recommend trying Logseq. It wasn't for me, but feature-wise it might be what you're looking for.
Failing that, using todo.txt for your notes might work better. However, the only usable app on iOS for this is SwiftoDo, and you would need to figure out how to sync the file yourself.