Could I impose upon you to take a photo of the hot shoe adapter in place, so I can see the manner in which it impairs access to the buttons?
Here are two pictures. One showing the elevation of the shoe adapter (almost enough to get your finger under, but not quite.) The other is a downward shot to see how it partially covers the buttons.
The buttons are not completely blocked and they can be pushed with bare hands underwater. I have not tried pushing them with DUI zip gloves yet, but I can image it is very difficult.