The Set Display Brightness one is the obvious choice, but it looks like it (for whatever reason) only sets the brightness of the display the mouse is on if that’s an issue for you (with multiple monitors). But it does the setting in percentage points, so presumably you could set it to any value.
I don’t calibrate my screen, but I use a different preset to do photo editing. My regular monitor profile (Apple Display P-600 nits) with True Tone on and a lower brightness, and then I have an edited preset for photography with Two Tone off and a higher set brightness (Apple Display P3 D65 Photography). It’s not quick, but it’s easy enough to change for my once a week photo editing session.
I has been a while since I watched his videos. I’ll re-watch over the weekend and see if it might help.
FYI - I got an official answer from Calibrite tech support - they said I should plug in their calibrator and perform a quick Luminance adjustment and not a full calibration.
Duh! Exactly what I am trying to avoid doing - I’ll reply back to them with a simpler description of my question and see if they have any other suggestion.
While not elegant, bettertouchtool could probably move the mouse cursor in a loop to each screen and then return to the original position after setting each displays brightness