Create clickable actions via AppleScript

Trying to use AppleScript to create a ‘Crop Tool’ that the user can click on - thus firing more scripts. My script right now creates a shape that I need to position over an image to crop. Right now I have to fire the same script again after the shape is positioned. What I’d prefer is that the user can drag and click another shape to finish the crop.

I was thinking about attaching another script to the shape that would then do the actual cropping…but I can’t figure out how to attach an action to a shape via AS.

Perhaps there is another/better way to do this.