I love Campy brifters compared to newer Shimano versions for my smallish hands, so I support your experiment.

One thing about going 11 speeds is that the shifting adjustment will have to be spot-on, will be a bit more finicky than 10-speed.

Yes, the narrower chain won't last as long. But it should last a pretty long time.

I really became verklempt when 10 speeds came out...I mean, 11 speeds, who needs that? Yet the demand is there. Why not.

Regardless, have fun. Athena is a good group. It is really good stuff. Very different from Shimano, but very reliable. Expensive, though. It would be cool if Campy stuff came down a bit. A bit pricey relative to the other offerings, imo.