I have used a system for some time, that works for me. All my notes, including ones I put in ‘finder comments’ have an eight letter and date prefix. These do tend to be in headings, titles but a lot are just in ‘finder comments’, as I said.
I have showed it to BLUEFROG regarding my Markdown notes. It is really quite a simple system. The sequences are not going to appear in other searches because of the length and yet easy to remember and are. and example is “trnq nphy 2024-02-28 blah di blah” The text expansion leaves the cursor after the date and I type in details I need. I have more complicated versions on Keyboard Maestro.
The first four letters have just two kinds and there are 9 variations of the second set then the date. I use a text expansion on Keyboard Maestro to do them, it wouldn’t work well if you had to manually type them in. Any text expansion tool would do, I think you might be able to do it with a smart rule, or something like it.