I don't know the EWA S8K matte box, but looking at the picture, the bellow and the rod construction as well as the mask and mattes supplied look identical to the Bauer Kompendium that was offered for the Bauer A 512 and Bauer S 715 XL microcomputer, and which also came in the Profi-Set and the Trick-Set respectively for those cameras. So it should accept lenses with 62mm diameter. The packaging shows a Bealieu 4008 ZM II with the Schneider 11x6mm, being a 62mm lens as well. The additional rig-rod is probably what is required to be used to mount it on that one (as the handgrip is off-horizon with its tripod thread).
I think it should mount well on a Canosound model with the rig-rod and the rods on the bellow holder.
... in theory... (covering my ass here