Nice find. You'll probably be able to find another Ofmega crankset like that. They were fairly common OEM on Italian bikes. Galli, Gipiemme, or of courese Campagnolo would be reasonable substitutes. I'd stick to the traditional non aero type, just for looks.
AFA celeste goes, in my view Bianchis look best if the only celeste item is the frame itself, and maybe the water bottle. Grey housing. White, black or light blue handlebar tape. Black saddle.