Micro:
That scenario of the false oversped triggering undue high speed protection, when you are actually flying very slow, is dreadfull. But I believe you can still use manual pitch trim to achieve pitch down.
As I said, you will have to "change the Law" in order to pitch down, otherwise, in Normal Law, the Overspeed Protection will take control.
To those who say that, this is a very unlikely situation, I would like to ask if you think this would be absolutely impossible to happen?