It might not be much, but it works. DIY button box. : r/simracing
Amazon.com: SJ@JX Arcade Game Controller USB Encoder DIY Kit LED Cherry MX Microswitch Lamp Button 4-8way LED Joystick Gamepad Code Board for Xbox 360 Nintendo Switch Hit Box Raspberry Pi PS3 PC
Free STL file BP12 Button Box - USB - DIY・3D printing template to download・Cults
29 Function USB Push Button / Ign. Key / Toggle Box for PC racing and flight sim in Video Games & C… | Diy tech, Diy electronics, Electronics projects
Sim Racing Button Box : 8 Steps - Instructables
STL file Small DIY Button Box USB・3D print design to download・Cults
🕹️ D.I.Y Button Box - Step One - What Hardware To Use - 🔘 - YouTube
FAQ #231: Button box made from a keyboard
How To Build A Button box for PS3 and PC | Marcushwang's web log