[ptomato]

I'm not aware of any commonly used linux FS that allows `/` in a filename

[rs_rs_rs_rs_rs]

What about other note taking tools that allow `/` in the title? How aware are you of them?

[runald]

Not quite what you are demanding for, but you can use ∕ instead of / https://www.compart.com/en/unicode/U+2215