Hmm. Sounds like that would require software skills rather than something that I'd be able to do rather than cobble together by getting some off-the-shelf software to talk to each other.
The other thing that struck me as tricky was getting the real stream to start to play once I'd clicked the shortcut in the radio list.
oh well, maybe someone will figure out how to make it easy one day. Since my orginal post, i saw that someone has got something working for the Slimp3, so there's hope!
http://www.dur.ac.uk/p.j.heslin/amusements/alienstream/version2/