Thank you all for your very helpful replies! I had talked to him about perhaps wearing a face mask, which combined with the 3D glasses might protect his face, but he was not convinced. I think droplets directly in his face would upset him, so it might not be worth the risk. Although I do like the idea of covering up the sprayer if a CM can show us where it is. Our trip is still a couple months away, and he gets less sensitive every day, so I will have to play it by ear based on how "brave" he is a couple months from now. But it is good to be armed with this information so we can make an informed decision. Thank you all!