Ask HN: Recording Calls on iPhone Using Bluetooth

Has anyone tried making a fake Bluetooth "headphones" that forward audio to some real device and recording it in the middle? Avoiding the requirement of a 3-way call.

I have given some thought to getting myself an iPhone, however I can't get over it not having any kind of call recording readily available in Central Europe, at least not any I'm aware of. And this thought crossed my mind, I don't know how to even search for it, so if anyone has tried it with any outcome, success or failure, please let me know.