In the mean time I've heard from Simon at intravention.co.uk that this isn't going to work. He has taken apart two MK4 units, one was coded for the monochrome radio and the other for the 16:9. He claims that the mono version was missing the video circuitry, so it can't possibly work with the 16:9 screen.

Could it be that it works for some people because they have the MK4 hardware with the video circuitry but coded for mono, but others have the MK4 units without the video circuitry so they are able to recode it for color?