I'd just build a mount out of wood or whatever and paint it to match. It shouldn't take that long to do. It doesn't have to be anything ornate or fancy.
What you don't want to do is anything that makes replacing the camera harder. Electronics like that tend to fail pretty regularly. If you get 5 years out of it, you're doing good. So I'd build it with future failure in mind.
Why not cut and fit a piece of tubing with an i.d. just large enough to accomodate the screw. Paint it white. That way you can easily remove and service the camera and cover the screw without making any more holes in the wall.