well seeing as how CX levers were designed to be used with road aero lever systems to provide a top mount brake solution so you could brake from the tops rather than going to the hoods/drops to get at your brake lever, I don't know why they wouldn't work =P
I'm thinking of getting a Tektro RX 2.1 from Nashbar but they come in only 31.8 mm. Do you have to use shims to mount them on a 26 mm or 25.4 mm bar? Is this a safe/workable solution?
i have the nashbar levers and am satisfied. i used a shim made of a cut-up shaws 'frequent shopper' card. i cut it to fit the width of the brake clamp (term?) and then cut it to the circumfrence of the bar. seems to work so far. you might also try using snips to cut a width from a soda can.