I remember when I worked at BestBuy, during the initial period of prototype/alpha testing,
we would test the BBY branded docks, the iPhone/Ipods would all bark, "this USB device is unsupported blah.... " but then it would still play music without an issue. It would control the iDevice also (fast forward, Fast Backwards, Next, Previous etc).
So if that is still the same, all the DACs should technically still work using the Lighting to USB cable provided by Apple. It might bark that it is an unsupported device but should work.