Athena triple hung on for a few years after the rest of the group went out. Only the crankset, long cage RD, and shifters. But it looks like it's done for 2019. It's on Campy's website from a Google search but with nothing linking to it. Some places still have it in stock. The crank is the old smooth 5-arm and not the styled 4-arm if that's something you still want.
I got some of the shifters from Ribble about four years ago for a Shimergo build on my commuter and they worked fine with a Shimano Sora FD. I also got some of the very-bottom-group (Veloce) shifters for a Shimergo setup on my BIL's old 2x7 Diamondback Centurion road bike and they acted just like my triple shifters even though they were sold as double. That was confusing.
I suspect the new Shimano RD's are close enough in ratio to the Campagnolo to successfully work or be one speed off, but I've seen no one try it and don't have the scratch to be buying them just to do experiments.
