Logseq actually does not need to be run in a browser, there are apps for every system. It does not have any sync server to host though (so far) so you have to use syncthing or something to have your notes available between devices. It does store notes in .md format with clearly labelled names so you always have access to them.
It does have a learning curve and android apps still do have some bugs to iron out, but I started to really like it and use it as my bullet journal.
The whole system of linking notes and even singular text blocks works really well in my mind. I can write a quick note about my health in today's journal file and tag it with #health and when I go to the health file it shows every mention of that tag from everywhere.
Maybe just a cheap android tablet? I know it would be an overkill but you can get one for less than 200 euro and it works well for that purpose.