Barn,
It is my understanding that the Madstad bracket is designed to be able to use the stock windshield and any windshield that would mount to stock location.
I have had stock, smaller Madstad, Puig touring screen, and larger Madstad mounted to my Madstad bracket without issues. If the Parabellum you are looking at is designed for stock windshield mounts then it should also work with Madstad bracket.
I prefer the 22" madstad myself. Everyone is a little different and has different preferences. I feel obligated to say that I tried all my helmets including two Arai's and one Schuberth. These were not only "good", but great helmets on other bikes, but I got really bad buffetting and noise until I tried the madstad screens. The strangest thing was that my Schuberth was the quietest helmet on my Tiger, but was the loudest on the Tenere with the stock screen. Even the tall Puig touring screen had some buffeting although significantly better than stock.