If you want more examples: https://wtfhappenedin1971.com/

Since I have a degoogled phone, I got a USB Bluetooth dongle for my server. If you use docker (like me) it is a bit tricky but doable. I was furious thinking Google is unavoidable, but it is just a sign of how bad android is tide to google...

In France, I have 3 different banking apps that works totally fine with eos. I don't know if it would apply to your case, but it might be worth the shot

If you want, here is my framework when I am full of frustration but seek answers:

1. Open new file
2. Write my thoughts unleashing all the frustration I have
3. Calm down
4. Put the file to trash
5. Open new file
6. Write my thoughts and question in a respectful way to engage in healthy conversation
7. Copy and send online

You can totally do that in nextcloud. All your file structure is keeped in the directory of nextcloud. The database only keep metadatas about what is shared and such things. One soft that strip the file structure and store it only as metadata in a database is Seafile. For your usecase, you can drop your files in your nextcould directory at the right place and invoke the command occ files:scan. It doesn't watch for file changes, but you could certainly setup a Cron or a script to invoke it remotely.

The Fxtech Pro1X experience was enough to make me run away from all new "Linux phone" projects.