The new digi out card is 12 channels so no issues there. The mc8 and mc12 comes with an aes/ebu to db25 converter cable, so no issue there either. This would work perfectly fine. The only two concerns with this approach are (1) the signal will be downsampled to 48/16, and (2) it is a rather expensive use of a cbIII hd as essentially an input switcher, decoder and HDMI to aes/ebu converter. If it was legally possible you could a dedicated box doing this without the down sampling a few grand. In it would look like meridians Hd621 box, without the encryption, although the hd621 requires the source to do the decoding I believe.