The good news:
DEVICE.FLIP flipped my screen upside down.
The bad news:
DEVICE.FLIP again does not seem to switch it back.
Tried a power cycle and tried to issue the op again but I’m still upside down.
EDIT: Please disregard the italicized bad news. I was typing DEVICE.FLIP into one of the scripts instead of the immediate command window. Apparently I don’t read so well upside down.
Seems to be good, and I’ll do some more testing.