I agree. That was the fist thing that came to mind when I bought my B1SATs. I just never got around to trying it out.This combo begged to be tried because all the parts just fit with minimal work.
I noticed on another C/Ku combo is that the Ku LNB had its own scalar ring in the deep back end of the C waveguide. It doesn't look like we could fit rings back of the B1.