XM Radio addon to Aux cable

I have a 2007 Prius base model that does not have a aux cable...I've checked multiple times where they should be. I very much want to listen to podcasts and such. I bought one of the radio transmitters that allows you to create a FM station, but the sound quality sucks. My beautiful baby prius is outfitted with an XM radio that I have never used as it has not been activated since I purchased it. I don't really care for satellite radio.

Has anyone used the wiring from a XM Satellite Radio ad on to create an Auxiliary input?

Do you think simply adding a 20 pin Audio input adapter would work?

Earphone Jack 3.5mm AUX IN Audio Input Adapter MP3 Player Phone For Toyota 2007 2008 2009