Since you seem to be going down the chrome path, I'll share a tidbit I discovered all the way back in 2000. Our master cylinders are Nissin--same as lots of Japanese bikes. The caps are the same size as many Japanese models, including the 1984-1987 Honda Goldwing.
Drag Specialties used to make a very nice, tiered, plain chrome cap for those models (no emblems or anything else). I have them on 1525.
I've recently tried to see if Drag Specialties still sells that model and come up dry. If you want chrome, you might call them and see if they're still available. Part number: DS-373761