That's good that BBE is willing to look at it. Also great for your guys that you can just slap in bulbs.

For the red and blue issue, I think the red will be overpowering. I had to do the opposite on my old set up. I had white LEDs behind everything except the tach (and it glowed blue so you can tell how much blue tint the factory overlay is). I had red LEDs put behind the tach and it still glowed pretty red: