No I haven't done it yet, though I am curious whether anyone has tried it with any measure of success. I know Andy Ross did some work in this area and there is even a photo of one of his bicycles in a book on heat engines; - not that I've been able to find a copy of that particular book yet
Anyone else that anybody knows of who tried doing this?
Edit: The picture of the bicycle is on page 78 of The Stirling Engine Manual by James G. Rizzo