Could altitude and speed data from gps not be entered into the flight computers and compared to pitot static data with any major deviation between the the two setting off alarms? SLF here
The critical speed is airspeed, not physical speed over the ground. Consider a simple case where there is a 200 knot tailwind. The result will be a 200 knot variance between the GPS and true airspeed, yet the aircraft would be perfectly happy in the air. No warning needed.