UBW would be useful. Unless we're seriously making the argument that fake NP barrages as arrows don't matter, despite the existence of things like Kazikli Bey, Phoebus Catastrophe, and Heavenly Demon Rain. Not to mention that the Da Vinci event has EMIYA outright saying his weapons aren't inferior to their originals "in numbers" indicating they hit as hard, but have some sort of conceptual degradation (and being fragile). If nothing else, the sword rains would be a good complement to his weapon switching, and could be used defensively, like how Gil did it to Saber.