Looks good except for this one. I will use accidentalThreeQuartersFlat2 instead since it's also part of the Stein-Zimmermann accidentals. We would then cover these 4. And with the arrows we would have 6 of the Gould ones. Sori and Koron for "Persian accidentals". And then 4 of the Arel-Ezgi-Uzdilek.

I could find any reference for the double arrow ones and the mirrored-flat-slash and flat-flat-slash either. Plan would be to remove them for now. They are probably not used much anyway.

I will merge and make a fix for accidentalThreeQuartersFlatCouper