I was thinking of adding the CD-UB100 to my Z1. It is IP Bus connected, and comes with a USB cable. I pretty sure there won't be any type of viewable interface on the screen. The Z units are not on the list of compatible radios. Worth a look see though.

http://www.pioneerelectronics.com/PUSA/Products/CarAudioVideo/Accessories/iPod/CD-UB100