Radio and windows on until door opened

I would think a few diodes might work. Instead of powering the whole Accessory Wire and everything attatched to it. Try this. Cut the supply to the radio and insert a diode so that it can't back feed the entire accessory circuit, do the same thing to the feed that powers the window circuits. Then with the relay system that you already have setup (top of this post) connect the power output to the windows and radio side of both diodes so that current doesn't flow to the other accessories. I don't use diodes everyday so tell me guys if you think this would work.