There was a brief fashion for this kind of thing in the early part of the 20th century: several of Les Six used these kinds of schemes for accidentals at one point or another.
Oh dear… - as if it wasn’t difficult enough… - glad it didn’t catch on
What was Les Six ? (just answer if you have nothing else to do…
As they say, “let me Google that for you”
I use it.
Here for instance: https://drive.google.com/file/d/0B1x21Ac1P4OVNGE0OG1QMndXQ0U/view?usp=sharing