Look, I'm no expert, but the plate is a fuel 'distribution' plate, so it doesn't matter what fuel you're supplying, the plate is simply moving the fuel evenly to the appropriate locations. Correct me if I'm wrong, experts, but I believe you're fine. The nitrous mixes with the fuel and is 'distributed' with assistance from the plate. I believe you absolutely still need the plate to do it's thing, and especially with a power-adder such as nitrous.
Anyone disagree and I will kill your face!!