What kind of button mashing bot are you building that you are worried about lubricating your actuators? 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 a black box that we have limited control over, it’s a single point of failure and it’s mission critical. Bad combination.