Use the icon of Script Add-ins in a script dialog in other scripts?

There's an example here:

While that loads a PNG, you can change it to load a ICO and it still works. The script package includes both PNG and ICO images, so you can test it by changing this line:

Dlg.control("cat").label = Script.LoadImage("cat.png")

To this:

Dlg.control("cat").label = Script.LoadImage("cat32.ico")