What kind of button mashing bot are you building that you are worried about lubricating your robot? It’s really not that hard to implement a lube tube that dispenses a small amount on a set frequency. Then you just have to monitor lube levels, tune your lube tube, and replace consumables whenever.

I’d be more worried about maintaining the button, to be honest. That’s an external system that we have no control over, it’s a single point of failure and it’s mission critical.