AoA meters ? But isn't the opinion that just holding pitch and power would have been sufficient to avoid the stall ? Once stalled, with the stall warner sounding, altitude bleeding off and nose high, it is distinctly unclear what another instrument would have added. Admittedly I can see how it may help recovery to optimise pull out and avoid secondary stall but given that the automatics were actually announcing 'stall' it isn't clear that having a readout which could be interpreted as showing a stalled condition would have helped given all the clues available anyway.
Isn't the more immediate problem to understand why, with all the 'help', the stall condition wasn't recognised and if the 'help' wasn't actually a hindrance.