Xpadder: Use Your PC Gamepad Instead of Keyboard - RetroGaming with Racketboy
Amazon.com: Sehawei Mouse Keyboard Converter, Game Controller Adapter for USB 2.0 Mouse Portable Keyboard Adapter Compatible with PS4/Xbox One/N-Switch/PS3 : Video Games
Anton Shabunin's blog: Red Dead Redemption 1 on PC using Xenia and keyboard +mouse