Ok, I know it doesn’t make any sense but I wonder if it’s possible in Retroarch to set an image as background, so it’s drawn first and then the game canvas and the notifications. It would be really convenient for not worrying about game aspect ratio.
Overlays is the closest thing to bezels that I’ve seen in Retroarch. That’s why I ask this in its forum, but I guess it’s not the most logical place ^_^U