Being Australian I naturally looked immediately at a post bearing the word Boomerang.
I have certainly used follow spots with
gobo slots and I have used follow spots without gobo slots. I'm a bit out of date on the newer gear and I'm on a different continent so the lanterns would be different but the idea certaily works. I used a CCT 2K followspot with a heart gobo once for the finale of "The Boyfriend".
AS far as whether the idea is a good one or not. You are the designer. If the image fits with your design and you still feel strongly about that when you have got further then it's a good idea. I don't believe there are bad ideas as such. There are concepts that don't work but that means that when you get into the
theatre and start the tech's if it doesn't work the way you envisaged it you may need to modify it or drop it. That doesn't mean it was wrong or bad as an idea it simply means it didn't work this time.