Is there a way to determine the most recently executed macro (preferably its UID)? I’d like to set up a hotkey trigger in KM to repeat the last macro executed.
No, there is no good way to do that.
The best not good way is probably parsing the last line of the Engine.log.
Be careful that you exclude the “Repeat Last Macro” macro from being considered or you’ll end up with your macro looping endlessly.