Jack, I've replaced my valve, so it can be done. As I stated in my first post, be sure everything is still connected to the valve, other wise when the screws are removed, the valve will fall down. If everything is connected, the valve can be lifted out. If you replace the valve and everything is secure to the new one, simply lower it back down in the hole to line up the screw holes. It took me maybe more than an hour to get everything to line up. While I vote with Joseph to replace the valve while it's accessible, but if you are a person with little on no patience, perhaps you should leave the valve alone.

Regarding radio removal, I posted something on that a few years ago. You should be able to use the search function to locate the post. You are right, not very much fun to remove the radio.