Schlumpf_to_Shimanoicetech203.STEP (180.9 KB)
Had some spare time, so I drew up a quick prototype version (I found the dimensions for the shimano rotors on the brakefast documentation), that someone could 3d print to check fitment. As a final piece it could be lasercut/plasmacut from steel (definitely strong enough), or aluminum (maybe not enough thickness to be strong enough).
I would probably just nut and bolt (m6) the connection between the icetech disk and adapter, since there is not really enough thickness for tapped holes.