The only combo product that I had personal experience with was a Marantzstreamer DAC Amp many years ago and it was terrible, buggy on the streaming end, buggy and with non existent CS.
I know the OP said one box, but given the size of the Wiim and the Bluesound Nodes, which are both just a tad bigger than wallet sized, I think the OP should be a little flexible here as either product will be barely visible sitting on an integrated amp.