A mini proof of concept: You can start Target Display Mode from KM - just use the key stroke for it. (Thanks JMichaelTX!)
Key stroke is cmd-fn-F2 when F2 is mapped as function key. - Note the question mark keycode in the keystroke field! 
A mini proof of concept: You can start Target Display Mode from KM - just use the key stroke for it. (Thanks JMichaelTX!)
Key stroke is cmd-fn-F2 when F2 is mapped as function key. - Note the question mark keycode in the keystroke field! 
How did you get the ? into the simulate keystroke
Well, I typed the Key stroke cmd-fn-F2 -- cmd-? is only what Keyboard Maestro shows.