Earlier quoted context omitted.
I am cursed with enough musical memory that if I learn a piece from sheet music, my sight reading literally turns off and I play from some combination of muscle memory and ear. That might sound like a humblebrag, but it's not -it's quite frustrating to "work on reading" and then realize I'm not actually getting better at reading. When I come back to the material later, the short-term musical memory has usually faded…
This may sound crazy but my sight reading improved a lot after I took an ear training class that required me to work in arbitrary clefs. I always knew treble and bass from playing piano, and had really memorized the note positions in each. When I was suddenly forced to work in tenor, alto, soprano, baritone clefs, I could no longer rely on memorization of note positions. I had to pivot to “reading intervals”. A fifth…
Really? I don't think all fifths look the same even if they're all in the same clef. If you're working in C major, B to F looks like it's a fifth, but it's a tritone. Everything around this becomes a little weird; A# to E# looks like a fifth and is one, but A# to F is a fifth and doesn't look like one.
Random clefs seem like they would make that problem worse.