No, the Bluetooth kit is your only option here.

The Bluetooth eject box (what you have), does not have any wiring that connects the phone's dialing control and speaker outputs to the car. It assumes that everything else is going through Bluetooth. The eject box only has the wiring in place to charge the phone.

Second, you would need a Telephone Control Unit in the trunk that could recognize the iPhone. The TCU in the car now can only recognize the Motorola handset that you have removed. The Bluetooth ULF module is the component that would replace your existing TCU and connect the phone to the car.

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MKIV Navigation, 16:9 Display, Bluetooth, TV/Video with Backup Camera, Sirius, and Aux Input