a lot of the money spent on the Cabri design was the crash worthness in the event of a botched auto. It was proven during certification you can have an engine failure, lower the lever to the bottom and not raise it at all. Hit the ground at max rate of decent and live for another day. Airframe will be bent by you won’t be. Bruno designed this with night flying in mind, and it was the most expensive part of the certification due to crash tests required.
However, as others have said that should never be necessary as the RPM range for an auto is massive, with a head that can not be oversped.