Yeah, that sounds like a "pickle" to me then. You probably aren't going to be having a ton of luck then, at least not until the ability appears in a future kernel to read audio data that way.
Here's something you might wanna consider though...
You could rip the audio CD to your HD into a temp directory, then listen to it, when you are finished, simply delete the files. When I use grip to do such a thing, it doesn't take very long to rip, maybe 15 minutes at most.
This might be something to consider.