Only problems I see are this: how do you tell the 1050 to use the digital in as the source (so you can have that signal sent to the preamp outs), and then also have it use the 5.1 direct input that you get back from the ICBM, amplify it, and send it to the speakers? You'd have to forego the ICBM for the center surround channel, too -- there's a preamp out for it, but the direct input is 5.1. The sub would also have to go from the sub out on he 1050 to the ICBM to the sub (can't pass back through the 1050, but it wouldn't need to anyway).

The last two items wouldn't prohibit using the ICBM and 1050 like you are describing, but the first one appears to. Somebody may have a way around the "which input does it use" problem, but I don't see one.