A33Zab,
First, thanks for the documentation as the information on the BUSS is IMO seriously insufficient. A video animation for anyone who operates such equipment should be readily available ...
If I get you right, the green - red scale is fixed on the PFD, green always in the middle. Only the Current AoA line is moving.
Now, is it possible for the AF447 scenario, that the Current AoA line would not have been visible at the bottom of the SLOW side of the scale as the CAS was already well
below VLS, and the red lower area is for a CAS
above VLS ?
Its advised to not use it above FL250 because theres the assumption there is sufficient altitude to recover an UAS.
The QRH leaves no latitude at all - It is a 2 cases scenario - Either you're above FL250, either you're below.
If above, you're good for a
4 pages QRH procedure ...