Indeed QT_MAC_WANTS_LAYER=1 makes a conda-installed CQ-editor work.
I think I gave up on conda earlier in my CQ journey because it took so long to decide what it needed to do. Today I was more patient (and timed it) and it took ~8m, which seems excessive to me (not a conda user normally, so IDK if this is typical, though the internet suggests that conda-is-slow is not a unique observation :)).
That said, it's an intuitive UI for me (I spend a lot of my day in notebooks) and the ergonomics are nice (scratch cells, keyboard bindings make sense to my fingers, etc).
Building OCCT on rpi seems like a significant undertaking; AFAICT from glancing through the build instructions it seems like ARM is only a supported target for Android & iOS but not Linux.
The latency of execution/rendering on my OS/X machine makes me not relish the thought of moving that computation to the punier RPi.
Cheers,
-a