I thought of this, and looked into it, and i'm not going to bother, as the little bulbs that go behide the heater controls and the one behide the light switch are clear, so to put in red ones, you'll lose the brightness. and cos there clear, the green look you get, is on the inside of the plastic planels anyway, so it's pointless. the mk4 must have red backing to there controls to make them red.
So the only thing you can do is.....a Mk4 dash conversion,

oh well.