Not a problem if you can find a Shimano shift lever boss to solder on - If you go with a standard lever that fits the campy type boss you just silver solder on the boss using a jewelry torch and regular silver solder and flux used for soldering copper pipe plumbing - Yes this works - And yes it is strong enough to do the job - Follow the links for a little ore info...
Problem with shift lever boss:
http://www.bikeforums.net/showthread...pes?highlight=
Regular Campy boss and other things to silver solder on see ART 296:
http://www.framebuilding.com/Bosses.htm
Fairly good Chicom torch:
http://www.harborfreight.com/micro-torch-42099.html
Soldering:
http://www.youtube.com/watch?v=RwKdM...eature=related