Blackwood up and down accidentals

[ButterBuilding11]

Hello to whoever sees this, and I hope you’re having a wonderful day!

I was wondering if there would be any interest in adding Blackwood’s up and down accidentals from his Twelve Microtonal Etudes (1982) and detailed in his article “Modes and Chord Progressions in Equal Tunings” in Perspectives of New Music (1991)? They’re similar to the up and down arrows, but with a circle centered on the line or space of the notehead so it’s clear exactly which note is being modified. Blackwood combines these with sharps and flats, so in the etudes he uses ten unique glyph combinations. The number of each etude that each glyph is used in is in parentheses:

Up (21, 15, 22, 24, 14, 20)
Down (21, 15, 20)
Double up (20)

Sharp up (22, 24)
Sharp down (21, 15, 20)

Flat up (21, 15, 22, 24, 14, 20)
Flat down (21)
Flat double up (20)

Double sharp down (21)
Double flat up (22)

I’m not sure if he ever explicitly names the double up, and the system as established obviously leaves room for more combinations not made explicit by Blackwood. I feel that his accidentals deserve a place among all the others.

Thank you so much!