Painting is the best way. I don't think plastidip would be good idea. It is too thick and you would probably have issues getting the switches back in for reassembly, wrapping might be doable if you cut bigger squares around the switch sockets. Of course you will have to totally disassemble either way, so I don't know why painting is a big deal?
I suppose you could have someone cut you a new plate, maybe out of orange plexi, or if metal have it painted pro at a body shop or something.
I really like the look of that Benq too, too bad they used the bigass enter so I would never buy it.