This is more expensive but I would recommend getting the cheapest DVD recorder you can get. $150 in Virginia. The audio quality is superb. Also, another great option is to bring a stereo VCR and use that. I think you'll find the audio superior to an audio cassette. Most people don't consider this because they are used to using a VCR for taping tv shows, but it works fine for audio. I'd try both and compare.
On another note: I have a guy who comes to a lot of my shows and he collects old cars from the 30's to the 70's. He has one that has an 8 track player. In that he has an adapter that let's you play cassettes in an 8 track deck. But he has a CD player with a cassette adapter so he puts that into the 8 track adapter. Hard to explain but he's going from cd to cassette to 8 track. Pretty neat, albeit a little hissy...
There's ingenuity for you!