Keyboard Maestro throws up a menu for any keystroke which has been assigned to several different macros/scripts for the same application.

If the names of the macros start with a unique digit [1-9], you can choose from the menu by typing that digit (otherwise, of course, a mouse click).

I use, for example, a set of OmniOutliner macros which apply the Nth custom text color (Nth position from the left at the bottom of the text color inspector), but you can assemble any kind of custom script palette that you want.

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