Originally Posted by ImprezaDrvr

If you set the limit screws on the front derailleur, in theory you'd be able to use the front shifter that you've already got. The adjustment will take some time to dial in I'd imagine, but if you're patient in setting everything up it should work relatively well. I'm in a similar situation with an old mountain frame that I'm doing a cross conversion on, but I'm just going to run a flat bar with a triple and appropriate shifters until winter when I may get more brave and try to get a double on it instead. Like sydney said, biggest problem could be chainring clearance with a double. You're basically gonna have to try it to see if it'll work for crap or not.