If something just breaks, I can't really see why he'd be sanctioned. It's not as though overall he'd have an advantage, would it? Obviously he would on straights, but when he needs the downforce he'd be screwed (so would be going slower).
The exception being where something hanging off and dangerous.
Yeah I can't see the FIA having an issue with it. If he was pressing the button elsewhere around the track it would be a different story.