semmern, I think that you miss my point. In many recent LoC accidents the crews did not appreciate that they were approaching the stall or in a stall. What training is given to improve these aspects? Stall recovery training is fine - it should be basic knowledge/skill, but if you don't know that you have stalled a real aircraft (not simulator) then what?
Fitting AoA is soft (meaningless) solution; if crews are not aware of airspeed then what value is a new parameter, is this any more likely to be seen than another 'speed' instrument if the instrument scan is deficient?
The failure of RA in simulation after the event probably cannot induce the same surprise as the accident crew apparently suffered. Is there any genertic 'surprise' training which enables crews to see and understand a situation in sufficient time, and then able to select an appropriate course of action?