Flight Controls ?
TheShadow :
Although I do appreciate the extent of your experience, the dramatic full upset situation you and many others base your thinking upon is possible but not established. This might very well be some half-controlled failed ditching.
Again, these switches are guarded and you don't touch them.
One possible use of these Flight Control Computer switches is to turn all 3 PRIMs off to force Direct Law. This is known by some and some keep that possibility in the hidden back of their minds.
Removing all PRIMs and SECs will give you the dreaded 'Mechanical Backup', in which a vaguely stable trajectory can somehow be established with the use of rudder and manual pitch trim (and possibly assymetrical thrust). Entering Mechanical Backup is likely to start with an out of trim situation.
But it is a big NoNo in so-called 'Airbus philosophy' (yeah, it's a philosophy). I do not know of any C/L that would even remotely suggest such a hideous breach of Airbus etiquette. If anyone knows more, I am interested.