Hyperveloce:
Is it only necessary to get a couple of ADRs in agreement to recover the airspeeds and the normal display on the PFDs or is it required that the 3 ADRs are simultaneously consistent ?
The FCOM don't say airspeed indications, either exact or erroneous, are removed from the PFDs and ISIS (otherwise, you could not sort them out in case of ADR DISAGREE).
How would the crew monitor the consequences/results of their actions (stall procedure) in the absence of airspeeds ?
There are other cues, like pitch/thrust or pitch/vertical speed relationships.
As was already mentionned by others, stall warning procedure is different from stall recovery. the former was very well described by HazelNuts39 in post #4100.
DJ.