Would the pull-GPIO0-down-from-code trick mentioned (but not eventually used) in this post actually work? (I guess GPIO32 on a PixelBlaze v3)
(I’m kinda desperate for something—I have one unused line in the cable from the PB to the output expander/control box, but given GPIO0 needs to be pulled to ground to advance to the next pattern and the buttons are currently wired to pull up to 3.3V to make that work I’d have to entirely rewire the control box which I don’t want to have to do at this late stage… I fly out in 9 days!)