Thank you for your feedback, it is much appreciated. In fact those designs were considered originally, but this design was chosen to keep the camera's center mass as near to where the user holds the camera as possible - this was found to reduce shakiness. Also following this idea - and inspired by a popular GoPro Youtube user "MicBergsma" - the camera is designed to rest just up against the chin for more stable shots. The video of his explanation is posted below:
Future designs will be made with the ability to mate with a SCUBA/Snorkel mouthpiece for added comfort and with this design, the camera mount will be lowered slightly since the user can have a tighter grip on the mouthpiece. Thank you again for your input, and please feel free to continue contributing with your ideas.