You can carry cash onto the airline and if the person in front of you reclines you can offer them cash to not recline. Or auction the cash to swap seats with someone who has someone in front of them who will accept cash to not recline.
It works at scale about as well as people slamming back when they recline. It’s not a bad idea, and I’d endorse recommending it. But it isn’t as reliable as paying for a better seat.
Or dump your apple juice on their head and claim accident.