I've done that, but without the color change. I'd rather keep the systems 100% separate AND not have cords draped through the house.
These outlets don't do ANYTHING unless a generator he had installed in the corner of his yard is fired up. He would then have to change his equipment from one outlet to the other by hand to make them work on the generator.
I also have 15w bulbs on a generator only circuit that feeds light sockets in various places. No candles needed to get around the house.