OK, wiring it into the aux is actually exactly what I was thinking when I said "some creative wiring." Anyway, check out the Online WDS link way above. This has most of the wiring stuff that you would need to do the project.

If you do not have it already, you will want to install the BMW aux input adapter cable. It has a couple small capacitors (or something), in the audio cable that tells the radio to activate the Aux option.

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2000 E38 750iL Highline Edition, Upgraded with the lastest 2006 X5 Electronics
MKIV Navigation, 16:9 Display, Bluetooth, TV/Video with Backup Camera, Sirius, and Aux Input