It breaks my heart just a little that users are so afraid of the Mega Bezel. Setting up a single image is really easy.
While not created for this exact scenario, take a look at this thread. . .
The second half should give you an idea on how to set this up.
The main difference will be that you want to use the TopLayerImage instead of the BackgroundImage, or change the layer order so the Background layer is over the CRT layer.