Would love a hot key to turn the output display on & off.

I did a show last week where i was mainly the Keynote operator, but also did Millumin backup for a couple sequences form the same computer.

Millumin takes over the output display It takes a couple clicks to get into the "disable screen output" control and a couple clicks to get out of it and back to Keynote. Would love just a hot key or a keyboard command to toggle that external screen control on & off