Welcome to the forum. I agree with you about the missing USB port in the console - I do not know when they stopped putting them in there. Mine was built in November, 2010, so it was obviously before then.
My Nitro initially came with the Media Center 130. I added my own Uconnect module. It installs behind the glove box, and has an external microphone that sticks to the ceiling, by the rear view mirror. (The instruction say to stick it to the driver's side "A" pillar, but I wanted it in the middle in case my passenger wanted in on the conversation) My Uconnect module does have a mini USB jack. I believe that there is a cable available for my unit, from Mopar
, but it is for an ipod. I believe that this cable would allow the ipod to run the head unit. But, any mini USB could be plugged in there!
Did you buy yours new or used? Where is the microphone for your Uconnect? If the microphone is built into your rear view mirror, then your Uconnect was installed at the factory. For some odd reason, the factory Uconnect module resides behind the right rear panel, by your infinity amp. At least, this is what I have been told. Before you do the next step, open your glove box, and let it fully open. Squeeze the hinges inward, and let the door swing fully down. Look towards the right side kick panel, with a flash light. The Uconnect module is a little black box, about the size of a router, and it will be mounted with cable ties on the kick panel. If not, then you will have to proceed with the next step.
The right rear panel is very easy to get off. There is a piece of trim at the top and bottom of the hatch opening - these just pop off. Remove the 2 cargo hooks. On the "C" pillar, at the top is a little square door. Pry it open from the top. There is a plastic lanyard at the bottom, that allows the little door to swing down. There is a phillips head screw in there. Pull off the "C" pillar panel. Then the whole panel just pops off. It is held on by friction clips.
The Uconnect module should be right near your Infinity Amp. If it looks like mine, it will have a mini USB jack.
I have since upgraded to a RBZ mygig, and my daughter streams her android with pandora, but as you said, she has to control the music on her phone.
Other than this, I am not aware of any way to hook a USB to the radio. My mygig does have a USB jack on the front panel, but it is only for loading music on the Hard Drive, via a flash drive. I haven't had this radio long enough to determine if I can plug something in there and have the head unit take over.
I hope that all of this helps you in some way. In situations such as yours, it would be nice to be able to come over and help you out. Let us know what you find.