I also hate wires in a car. I have a all in one sat/nav/blue-tooth/DVD player in my Rover 75 with my iphone in the armrest wired to a usb charger in there-so nothing is visible.
I need to do something similar in the Zaf, but with a single din it is a bit more difficult.
Using the usb as listed by you, one could fit a 12 outlet behind the dash, plug a USB plug into that and the CT29AX08 extension into that. A lot more simple than it sounds actually. The ipod input would be more difficult with a OEM radio, as there is no input. A blue-tooth unit would be the way to go.
Keep us posted.