Swap the free hub to Campy, an 11 speed will work fine on it. Campy freehubs fit 9-12 speed Campy cassettes, a 9 speed Shimano shouldn’t be but a mm or so off..there are no shift issues when using Campy-Shimano, some might consider it blasphemy mixing those two but it will work.
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Re: Rear disc conversion 9 to 11 [ret123]