Ok. Well first of all I'm not taking an iPad down with me when diving, and second, I need something that is more waterproof than 33 feet. So thanks but those suggestions didn't help.
OK. Here's some helpful info:
What you're looking for doesn't exist. Someone was trying to put something together on kickstarter but it was pretty clearly crap and doomed to fail catastrophically, destroying both the remote and the camera.
You're gonna have go through all the hassle of pushing the button on the camera with your finger.