Your best and easiest solution would be something like the Tuneai Firefly. Awesome quality and seamless integration. I use it in my E90 without iDrive and the USB/Aux connectors. OEM BT Audio streaming is not possible without iDrive, even if you have the combox.
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'16 M3 | '23 718 Spyder
Past: E92 M3, F87 M2, E39 M5, etc
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