I have been looking for a tool to tighten the headset. The one I made worked but it didn't really satisfy my requirement to really lock down the adjustment.
I had an inspiration while looking for such a tool and was reminded by the other thread on another Bianchi with a integrated HS.
I bought the Park SPA 2 tool after checking that the pins were close to the right size. Then I simply rotated each end.
Fortunately, this is a Campy headset per @Bulgie description, so it has 4 holes on the locking nuts. Now I have two tools to tighten it down.