Is there a plug in the back of your deck for a cd changer? Maybe a blitzsafe adapter wll work. I am not sure if you can get an RCA ouput on the ipod though. The blitzsafe converts the RCA's into a plug that pops right into the cd changer plug. I use one in my TL-S to get sound for my DVD/navi conversion. Its plug and play with the deck, and my PS2 plugs right into it which in turn plugs into the stock deck. Pressing the CD button twice accesses the blitsafe source. Maybe it's an option for you?
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Just call me.............Mr Hyde
03 Topaz Blue 540i M-Sport
The TL-S / The 540i