Eroica California was quite relaxed about equipment requirements the years that I did it. It sounds like L'Eroica in Italy is much more stringent.
There are plenty of good options, "aero" and "non-aero". Mid-80's Japanese single-pivot brakes with modern pads and cables are plenty good enough. Properly-adjusted centerpulls and cantis are both good enough (again with modern pads and cables).
Again, at least at Eroica CA, dual-pivots would not lead to excommunication. Better if they're polished sliver, though.