I got one of these recently and I’m pretty happy with it. It’s a repurposed iPad screen, 2k, 4:3, and put into an aluminum frame. slightly larger than your requirements tho. Got the version with usb-c and mini-hdmi inputs, and is USB powered. https://www.aliexpress.us/item/3256801503431249.html
This made me reinstalled ut2k4. Used to play the demo with orbital2 instagibCTF slomo low gravity. Good times.