Hi,
Machinbird:
The concept is clear: Stall is a function of weight to be lifted (by the airfoil) and beyond a certain AOA there is a fast degradation. Unload means "help" the wing (to do the lift) "reducing the weight" using physics.
Let me put both questions a little different (better):
1) Using this approach nearing the stall could avoid the stall? Sure, Yes.
2) Using this approach after the stall could make you exit? As you put, Yes. In this case with a pilot trained (to "feel" the zero G) in an airliner (similar conditions of this flight) do you think the "day could be saved"?
3)
In this case at what safe minimum FL the maneuver (by the same trained pilot) should be initiated (at what FL) to present reasonable chances to recover in time. (before SL
)
Obs.
The sooner AOA is reduced to un-stalled ranges, the lower the likelihood of entering a spin.
After a fully developed stall chances reduce fast due height loss, spin threat, noise (
), etc.
Unfortunately the "zero G" feeling is impossible (for longer duration) in the SIM