Conver Sirius XM tuner to aux input?

[Paranoidnormal]

Hello all! I am installing a tablet in my dash which needs to run to a aux in my radio. I have a pioneer mvh-s512bs which only has an aux on the front. I don't really want a cable hanging out of it so I am trying to see if anyone has had any luck adding a rear aux in. The radio has the port for a Sirius XM tuner and I was wondering if anyone has had success altering the plug to make a rear aux in. Any input is appreciated, thanks!

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