Customizable 3D Keychain Models

I’d like four fresh, premium-looking keychain models that I can print on an FDM machine and quickly personalize for every buyer. The overall theme is “personalized initial designs,” yet each model still needs space to swap in both the customer’s name and their vehicle registration number... (Budget: $30 - $250 USD, Jobs: 3D Animation, 3D CAD, 3D Design, 3D File Scaling, Slicing & Print Preparation, 3D Layout, 3D Modelling, 3D Printing, 3D Rendering, Blender, Fusion 360)