I've often considered what one could do to try to exit a deep stall. I think there's two or Given enough height I reckon I'd try:
1. Stick out all the low speed devices
2. Have everyone down the back see how close to the cockpit they can get + gear down to try to lower the drag line.
3. combined cycling power & elevator to try to destabilise the thing. May not be all that effective if there's not much power induced pitching.
4. Try to roll using aileron & spoilers far enough to allow gravity & airflow to cause a yaw towards the ground ie into the airflow.
5. Also try to roll, but using asymmetric power & rudder. Risk of spinning but at least there's the chance of an unstable bit while transitioning.
Discussion? Alternate suggestions?