Default USB mass storage????

I recently installed a aftermarket radio into my car that has a USB input. I would prefer to connect my phone in this manner instead of using the aux input. The radio only supports mass storage and not mtp.

I'm currently running aospa. Is there an app or a ROM that supports mass storage for external sd - card?

I do realize that as of android 4.2 mass storage was completly removed by Google. How ever as a hacking community we are smart and I'm sure someone had found away around.
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