Yup, used post-its for DD when she was scared of the automatic flusher. When I ran out of them, I used the stickers CMs gave out of Mickey that are on a strip. I would just lightly stick them on the eye on one side. Then, pull it right off.
Post-its worked much better, make sure you bring enough. I brought one pad, thinking I could re-use them alot. But, the sticky part wasn't as sticky after a couple of times!
Good luck and have a good trip!