How about something like this?
What I did was run the AUX cable from behind, just like you said. Then, I tapped into my cigarette lighter's switched power, from behind, and I connected an aftermarket cigarette lighter with an USB adapter plugged into the aftermarket lighter. To connect the aftermarket cigarette lighter, drop in the after market with attached USB cable, behind the stereo, and pull out your cigarette lighter, by unscrewing the four screws. Then, you have clear access to the back of the cigarette lighter.(Note:You have to remove the console plate to see the four screws, and you can also take out the four screws for the Air assembly and pull it slightly forward to facilitate routing of the wires.) I routed the wires through the cigarette lighter hole, to the back of the cigarette lighter. Connected the power and the ground, and Wahla, power to the aftermarket lighter.
I then took it a step further. I brought a Bracketron phone holder and I cut off the front bracket. I grinded it smooth and repainted it black. I drilled two holes, into the side of it, to hold the Akron gooseneck. I routed the USB and the Aux cable through the Gooseneck. This setup does not move. It is very sturdy, and my Phone is right to the side of my face, and up, out of the way. The finished product is the picture below. No more do I have wires hanging all over my console. My original lighter is free to use. And, I don't have to look down and search for my phone, and take my eyes of the road.
Later, I actually put some slack into the wires coming out of my dash(see 2nd picture), and pushed them behind the bracket so they can't be seen. With the gooseneck being anchored to the Bracketron, and between the console, adds stability. This thing does not move, and it takes two hands to bend it. Basically, I bent it before I mounted it, so I didn't need to make major adjustments after it was mounted.