Oops, I got over-eager with the enter key there...Bagpuss, have you considered putting together an a cappella group? Maybe there are other singers in the area who are similarly frustrated. I met the members of my band through singing, not sessions. Just happens that one plays guitar and one plays flute. We do some a cappella stuff that audiences seem to enjoy. With just 3 singers you can make some beautiful sounds. And it's fun to take songs that everyone else has instrumentation on and make them your own.
Maybe you could start a singing circle and see if anything grows out of that.
Good luck, and certainly don't stop singing.
Emily