It works! However, I'm still trying to make it work just right.
I have to dig through the actions to find out if it can see when the .gif loop ends and then send it back to original button .gif. Right now I have it set to toggle visibility after a set amount of time, which causes some delay issues and lots of trial and error of flipping back and forth the visibility.
Another issue, (my own expectations more than anything) is that I was expecting button actions a little closer to Flash, with press, release etc. Intuiface only seems to have Tap actions for buttons. Perhaps I'm not looking in the right place, but only having a Tap function limits the amount of usability for this concept.
I will continue with R&D and see if anything else comes up!