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@retrodicorsa
Specialties TA seem to be the only people offering Campag compatible 11spd now, the keyword is 'Nerius' which denotes the offset hidden bolt. Can also be used to convert 10spd Centaur, Chorus and Record to 11spd. Sadly now only available in anodised matt black, but I've used these on silver arms and they look OK. Available from SPA Cycles:
https://www.spacycles.co.uk/m8b0s113p5379/SPECIALITES-T-A-Nerius-110-BCD-Campagnolo-outer-48-53t-Chainring
and Total Cycling:
https://www.totalcycling.com/en/TA-Nerius-Outer-Chainring-For-Campagnolo-11sp-Compact---110-BCD/m-19367.aspx