@mitu xrandr doesn't do anything if I put it there; it only does anything if I use a modified runcommand script

Update: After a pause to address some other stuff around the house I was finally able to rebuilt some of the internals of the Roadcase Cocktail Cabinet. The most recent work items included:

Remove USB Hub, replaced by. . . Mount Meanwell 5v PSU Reroute all USB connections (make longer USB cables) for arcade controls direct to Pi4. Rewire audio and LEDs directly to PSU (instead of USB hub) for power Rewire the mains AC to incorporate a split—Power the Pi transformer and a GPIO-triggered relay Mount and wire the relay in a project box to power the display and PSU (which in turn powers the audio and the LEDs. Remount audio amp, reroute speaker wires. Update my Python script to trigger the relay on another GPIO pin.

It was a lot, but I had to keep it all straight and do everything at once. Before this step, I had a USB hub tying the spinners and trackball controls to the Pi, but also providing power. This was not necessary with a small and cheap PSU. It cleared up some of the bulky power transformers and removed some hardware, but replaced it with other stuff. In the end, this is a bit more complex, but the controls are now plugged in directly to the Pi and I have a relay turning on and off the display.
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@retrofam I wonder if Auto-Rotate is overriding that. You might need to disable it.

@iandaemon My current cab is also of the custom variety. A bartop on a pedestal that I could squeeze in a corner, but nowhere near a full size machine.