Q:

Key signatures with Quarter Tones

I know how to write the key signatures for any note within the 12-note chromatic scale. I know this doesn't come up very often, but what are some ways to write out key signatures for passages of music in a key center based off of a quarter tone?
For example, I know A major has 3 sharps. What would a key signature look like for A half-sharp major?

I considered simply notating something like "A=453hz" and writing in A, but shifting between tuning systems can get a bit unwieldy (especially if performing on a real instrument) and I'd rather avoid that.
I considered having three "3/2 sharp" glyphs on F, C, and G, and placing a "1/2 sharp" glyph on D, A, E, and B. I noticed, though, that under this system, every microtonal key signature has seven accidentals in it, and a lot of them have "1/2 sharp" and "1/2 flat" signs in the same key signature (example: G 1/2 flat major).
I also considered shorthanding them, writing "3/2 sharp" glyphs on F, C, and G, and leaving the other notes with nothing. One advantage of this is that the visual look of A major is preserved, with the three sharp-ish accidentals, and the performer would know that all the other notes logically must be 1/2 sharp. It would be like reading a normal key signature, then seeing the altered accidental and deducing that everything is a quarter tone flatter than A major.
I'm open to other suggestions (as long as they use some form of microtonal key signatures) as well - there's probably a better system out there that I haven't discovered.

A:

In this video, the semisharps are simply written out completely in the same order as the sharps would be. Later on he uses a combination of semiflats and semisharps while still sticking to the circle of fifths. Although it's in the context of 31 edo, it should still be applicable (and you probably won't need the key signatures with both sharps and flats because in 24edo, the two 12edo chains aren't linked). The description of the video has some resources as well, such as a list of 31edo key signatures and some of the sources that he used.
I don't think there's any existing convention, so you're free to make your own as long as you explain it.

