I've got an 04 Avalon. It's got a tape deck and CD player, but no aux input or Bluetooth. It does, however, have a standard 120v house-like outlet. Could I get an Airport express, plug it into the jack, and plug one of those cassette things with a 3.5 jack to it and stream iPhone wirelessly to it via Airplay? If so, does anyone think it'd be cheaper and easier to install an aux jack instead?