Serius hookup for 02 Boxster S with Bose system

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My CD changer is singing with the choir invisible, which is OK. It did well for 16 years. Now there are more modern ways to go, so I ain't replacing the changer. I depended on it so I could avoid AM/FM radio which (in Southern California) has a paucity of good rock stations, and NPR - which I love, but I've just gotta take a break from politics to preserve what's left of my sanity.

Is there an inexpensive way to modify my current system so I can enjoy Serius, or a Bluetooth connection for my iPhone? I plan to sell the car in a year or two, and don't want to invest more than I have to. The current system is the CR220, which works (although the right knob would go from 1 to 8 to 2 to 12 when I tried to fast forward a CD).

Thanks in advance.