Actually this is our doubt too, we are planning to make different silicon skirts for divers from different continents, sexes, etc. Would it sound better?I did the survey, but I have doubts about this. Masks are personal: they don't all fit everybody, so would you have to make a bunch of different sizes and shapes? Would the computer in the mask restrict field of vision? Would a lot of people not be able to read the HUD without some sort of vision correction?
I know a shop that has one of these made by Aeris. I don't know when it was produced, but it's been sitting around awhile. It doesn't send SOS, but it has a built in computer and HUD display. Field of vision is a bit restricted.
So your idea isn't new, but I wish you luck in developing a product appealing and usable to a lot of people.
Really thanks for your brainstorming