Buy the antique white cabinets in the first place. There is no reason to spend money on something you don't like and then more money to change it. It will cost leastI four right from the beginning.

Too late to change it? I would think getting the kitchen cab look you want more critical than bath or other possible rooms. Cheaper to change others than an entire kitchen.

If you can't change cabinet color or don't want to is it too late to lighten the floor color enough to have a contrast. And using a light colored countertop will not make the kitchen too dark. With countertops being a horizontal surface they reflect light.