Eric Its already done but I'm glad you mentioned it if nothing else to kill any idea of someone patenting someone else's original idea.A "smart" AI bc is next folks. Computerized depth compensation, dial a depth, or maybe think a depth and it automatically adds or dumps air to get you there.
It was called a SRD Self Rescue Device originally designed by us lot for the military in training on the LAR VIII oxygen rebreathers etc together with a CO2 detector. Breathing rate and RTS computer would ascend a diver on a controlled assent to the surface (or at least help in body recovery). You could also control the assent of all the numpty divers on a timer that would have them all pop up at the same time regardless of those swimming off in the wrong direction to ensure swift recovery rather than letting the supervisors tea go cold waiting for them. Discussed with photos in RBW some years ago