David, I would opt for nice chrome clamp on pegs if you are trying to save the original paint. Any brazing/welding operation will destroy the paint for quite a wawys around the peg.
I just spruced up a Le Chemineau for a couple here in Ct. It was a ladies bike and she hopes to ride it in the daffodil parade on Nantucket this year... I am curious when did you get yours, and what color is it?
There are a bunch of Le Chemineau's floating around, I'm supposed to go look at one when I get time.
Do you plan to bring it to Cirque?