Ok. So I'm not done but here's how it works. It's easy but not cheap.
You need a lightning to HDMI adapter from Apple. I needed one anyway, so the cost was worth it.
An HDMI cable which you connect to it and to an HDMI2AV converter (found on Amazon)
Then connect an AV cable (composite: yellow, red, white) to the Lockpick input.
One more step, the converter needs power from USB (cable was included).
Right now I have it connected to the USB port on the front of my 730N and video works great. Watched a movie and slingbox off my iphone.
Here's the part I'm working on. I bought a 12v to 5v USB 12v to 5v converter.
I plan to wire that to my cigarette lighter. It only pulls like 3A, so no need to connect to its own fuse. Plus I never use that port for power anyway. That'll be much cleaner.