Ah...but AoA doesn't describe the margin of lift or margin to stall, once the airfoil has become contaminated. Stall speed changes, stall AoA changes, and the coefficient of lift of the airfoil changes...often radically. Furthermore, the stall behavior of an airframe can change substantially in the presence of ice; particularly asymmetrical icing, tailplane icing, etc...and is a function not only of ice buildup, but location, roughness (airflow separation), etc.
I'm certainly interested in the device, but curious why you introduce the topic publicly, then wish to reveal it by private message. You introduced it here, by all means, present it here.