What would you be looking for if somebody was calling "Microlight CD" - if you saw a white high wing a/c would you think it was that? Surely standardisation in radio terminology is meant to reduce confusion and this just seems to be introducing an additional factor for confusion.
e.g.based on a local airfield, you could have "Sleepy Airfield, White Cirrus CD downwind left hand 25" and then "Sleepy Airfield White Sirius DC downwind left hand 25". I think most people would go WTF!
How many people know what an Escapade looks like? Savannah? Tecnam (we have low wing and high wing examples near us)