I'd suggest you to take a look into the Conflict Palette , much more practical, and it would also help you organize all your macros in one place. Just assign the same keystroke trigger, ie "Ctrl-Shift-T" to all the relevant macros.
(Conflict Palette IMO is a confusing name for such an useful Keyboard Maestro feature)
if you still want to go the route of a Trigger when Mouse is clicked inside certain area, something to get started:
