Oh God!!!
First of all I have to say that this is a sign of times in which we are living. Every day there is a new instance in which a pilot makes a trial flight, inventing a new procedure.
I remember when, many years ago, a copilot had to have a notepad in which he had written each and every captain's mania. SOP didn't exist yet .
Second: among many civil aircrafts I've flown there is not the ATR (the ice grinder).
So I don't know if on its manuals and documentation there is a chart with Low Speed and High speed Buffet. But I'm sure not.
A DC-8, many decades ago, in the first company I flew for, discovered them on its own skin. She was unable to recover from stall neither reducing nor increasing the IAS/MCH. They had to descent rapidly from the higher altitude they went and couldn't afford.
Fly safely.
DOVES