Welcome to the forum,

Brian is correct, No is the short answer.

You have done as much as you can with out going the BT route, there is just no way to connect the phone to the cars wiring and for it to work as you want.

If you want the phone to "work" (make/receive calls, VR, on screen caller ID, SMS reading and phone book storage) then you will need to get either a TCU or a ULF and connect it to the 26pin d type plug (second from last pic), bimmernav make a converter lead I think.

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Sept 03, M3, Silver Grey. Retro-fits: Modded Mk4 DVD Drive, OEM Bluetooth, VR Control, Rainbow Speaker Upgrade, Sony SOT Amp, HK Sub, CCFL, Intravee II, NightMode.