Now this is a good idea! The NES Advantage is nearly as wide as the actual NES, and is, from what I recall, an extremely quality arcade-style joystick. I bet you could even throw a whole Raspberry Pi computer into one of these and run all sorts of emulators. Or even better, throw a Famiclone board in there along with cut out space for a cartridge slot, and you have a self-contained NES in a joystick!
All my childhood, I had heard rumors on the schoolyard about Super Mario Bros. coming to the Atari 2600. Tired of waiting, some guy actually went and did it. And it’s surprisingly faithful to the original. You can do some pretty amazing things with the Atari, you betcha.