The scanner and projector is amazing, but it would be even more amazing if it would render in more colours.
Perhaps if JourneyMap is detected, it can use it's saved pallete map to render the display?

JourneyMap isn't open source, so it's difficult to tie into anything it does. Do you know if MapWriter has any such palette that you'd be okay with integrating with?

I believe JourneyMap saves it's colour pallette in an external file.