Apple Lightning to USB Camera Adapter
As I mentioned, the T3Hub is a solution that works on both the older 30 pin iPhones and iPads that I have tested (I have used it with a 4S and an iPad 3) and newer Lightning port iPhones and iPads (I have used it with a 6 Plus and iPad Air 2). If you can find a T3hub, I would recommend picking it up if you need the ultimate amount of versatility.
Testing and compatibility
As I noted above, this setup does not work with my 30 pin devices. I don't know that it works with all Lightning Port iPhones, either. However, it works as a USB 2.0 hub, as well, so you could probably find a different use for it if you aren't as successful. Another possible issue, is that Apple could possibly make this "hack" go away with a firmware update.
I want to caution that you should buy this now if you are on the fence about it. Not knowing the company, they could stop making it tomorrow and we would be in the same boat as we are with the T3Hub. Since they are cheap, I am going to buy a couple more, just in case. I mentioned in the past that people should pick up apps like AIrMusic before they go away and I know people that visit my AirMusic app review are disappointed when they find that the app is no longer available.
If you decide to go this route with your Dragonfly or similar DAC, please leave a comment or send me an email about how or if it works in your setup.
A couple new notes: I have since ordered a couple more Plugable hubs and they all work with the iPhone 6 Plus. I also tested the iPhone 6 Plus with the original Nuforce uDac and it works with the Plugable hub and the iPhone 6 Plus, as well.