Angus Hi, I think the mounts you are thinking of are the much sought after and elegant design from Nifty, but as you mention they are for use without sidescreens,
Glasgow I dont think so, the hinge is around the same height as the mounting point for the standard mirror, obviously the mirror stem could be tailored for the correct height, the top hinge could also be used, but my gut feeling is that may look a little odd. One early idea I had involved a thin bar running hinge to hinge and the mirror could slide up and down to get perfect position, again not sure about looks, but I haven't discounted that idea yet .
Tim