Setting a shortcut key to "Add as To Do to Things" script

I use the “Add as To Do to Things” a lot. I’d like to set up a shortcut key for this and haven’t a clue how to achieve this. I have got Keyboard Maestro, but the Scripts menu does not appear in the menu in Keyboard Maestro nor is it accessible by just typing the menu name.

Any idea on how I can get the script to run with a keyboard shortcut? At the moment is seems the easiest solution is to copy the whole script in KM. Is there another way?

Thanks

Using System Preferences > Keyboard > Shortcuts > App Shortcuts, click the plus sign and add an entry like this:

Use whatever shortcut you want, taking care not to conflict with an existing shortcut. Be sure to spell the script name exactly as it appears in the script menu.