You might try making a new dial by using pictures from the web. You could scale it by measuring the diameter of your function dial, print it, laminate the top, and cut it out. I'd print it on a good printer, then use Twin-Tack to make it a sticker and put some Form-X film on the top to seal it.
There is a fairly good picture of the function dial here:
There is also one on Canon's 10D website, but that's flash and you'd have to do a screen capture, I can't give you a direct link. You could probably also find more on the web in various places, or you could ask someone here to take one with a spare camera and send it to you. If you still have your manual, there might be a good picture of it in there that you could scan or take a photograph of.