The bar really won't get in the way of lights to any significant degree even with the frame for the screen. I think you'll find the advantages of having two small screens for daily tasks (feeding, cleaning, quick access) will outweigh the lighting concerns. One big screen can be a bit of a pain. Especially if you have any height at all to the mounting.
But to answer your question...no. Haven't seen any top that don't take advantage of the bar in the middle. You could customize without would I consider excessive modifications (is there such a thing), not sure I can visualize anything 'clean'.