Fergus, you're wrong - fundamentally, absolutely wrong. There is no analogy, equivalence or any such like between FW stall/spin and gyro ppo/pio.
FW types can be certified for stall and/or spinning. These then become defined limits of the flight envelope (in the case of stall), or approved manoeuvres (in the case of the spin, where approved). Such types can legally be operated in these regimes, and safely be operated in these regimes (admittedly with a greater degree of risk than straight and level).
There is NO gyro certified for ppo/pio. It is not a flight envelope boundary. Gyro ppo/pio is not necessarily fatal, but evidence says that it generally is - but no gyro pilot deliberately goes there. However, a lot of FW guys (myself included) go into stall and/or spin, where approved.
I would strongly encourage FW bretheren NOT to think of ppo/pio as analagous to FW stall/spin. Jeeze......