Old question
In fact, it would have been easy to do as the only spec changes to homologate the 2004 Z4 were to have headlight washers (with Xenons) - which I have and activating the rear foglamps. The radio change is even easier as it only takes a few button presses. Since the car is Canadian spec it is already in KM.
However since I did not get any help from BMW or elsewhere, I gave the car away. I am now driving a Canadian spec M3.
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