Totally different wiring structure and communications platform. The two systems are not compatible with one another in any way. One is a D2B bus, the other a MOST bus, utilizing a central gateway to facilitate communications. If you wanted to purchase a new wiring harness and all new control modules for the vehicle, I suppose it would be possible. The parts prices alone would be more than an '02 430 is even worth.
Repainting significantly lowers the resale value of your car (even if it switching to one factory color from another). A good paint job that resembles the factory work will be around $8000. Also, American body shops have to use water based paints for environmental reasons which are not near the quality of the factory oaint applied inthe motherland. It will always be a sort of half-assed attempt at re-creating the quality of a MB paint job. From everything you've posted, you are an ideal candidate to trade this car in on one that actually has the options you want.