Should be the same as slaving any receiver to a big dish system or are you wanting to only have the Dreambox tied to the big dish? I do not find anything that says a Dreambox is DiSEqC 1.2 compliant which means it does not send the signals required to move a small dish motor. I am not sure just how the
VBox units operate but you may be able to use it in the middle to move the dish without taking commands from the receiver.