It would seem the solution is to train pilots in and require demonstrated competence in stall recovery from low altitude, high drag configurations with adverse pitch trim. Or alternatively, restrict AP trimming below a preset AOA by having the AP disconnect and hand the aircraft back to the pilots in a state which it can be recovered without exposure to an adverse trim regime leading to the likes of 80kts IAS and 40 degrees pitch up.
Or is all that too obvious?
I also like Checkboard's solution. Wouldn't have worked without manual intervention in the Buffalo situation though, as the shaker operation disconnects the AP.