J-tek makes cable pull adapters that might work with campy 11 shifters and the shimano RD, but with all the different models of shimano RDs, it also might not work. Google j-tek shifters.
You can still buy 11 speed ultra-shift levers, but none are in current production, since they are now all 12 speed. Only the lower level models are 11 speed and they don't work the same as ultra-shift.