yes, tough job. I think I had posted a basic outline of what to do before LvC got hacked and lost a few weeks posts.
but after taking cluster out, and taking apart, you need to remove the LCD panels themselves (they are glass, very thin, and very delicate). the green color film is stuck to one side of these. you would have to remove them, then put a different color film on. Not an easy job, and like I said, the LCD panels are not the strongest things on the car. Also, the film you use has to allow light thru, as these clusters are light from behind by regular incandescant lights. The exception here is the radio and climate control, which have there own systems.
the climate control cannot be color swapped to my knowledge, it is a true flourescent display, and the radio might be one also, depending on exact radio installed