I think that if you'd need to debounce requests, it would be better to put it in a pressed and/or highlighted state until the button is ready again. Then you'd indicate to the user that the press was successfully received and that pressing it again won't do any good.

The buttons in an elevator panel typically work this way. They each light up to confirm a pending request to reach a floor. They each turn off when its floor has been reached. And while a button is lit up, pressing it does nothing.