For those not having the newer DKV, it's probably possible to do this via MIDI. For example, my Macbook (in fact, all current OSX and IOS devices) support Apple's IAC for MIDI. There is also a network widget which will connect to another Mac device over a network (and if I understand correctly, over the internet) and exchange MIDI data. The MIDI data could then be locally interfaced to the MIDI connections on older DKVs.
Sam, let me know if you want to give this a try.
Scott