I like the idea -- to extend yours -- all the bookmarks and pages visited (or pages dwelled on for more than a minute) get full-texted and filed to a local LLM. And you can query directly, and it has the context.
It's a pretty simple script mapped to a hotkey. Press ctrl-xyz after copying a url and voila. Not much of an effort at all to maintain a stable bookmark file. I use txt over other formats because I'm unsophisticated. But it's no marathon.
Do you have a typewriter repair store near you? They usually sell refurbished machines as well as repair them and probably accept used machines for consignment. Personally, I just took my mother's typewriter, which used to be her father's, but not everybody can do that. It probably needs a new / refurbished platen, as the original rubber has hardened and most key presses result in double strike.