Hi and thanks for your question. At this time (Feb 2013), there is no way to have controls address individual ports, so even if you set up a sufficient number of network ports, you cannot do that in MIDI Designer. MD will talk to as many ports as you want, but without the ability to map controls to ports, I don't think you'll hit your goal.
Perhaps Sonar can respond to NRPN? There are a lot more NRPN parameters because you can specify two bytes. (trying to think of other, relevant possibilities but for now I've got nothing)...