Look at this USB option for Amiga 1200 Motherboards from Centurion Tech
Logitech MX Keys and Logitech MX Master 3 works with Amiga 1200 - Amitopia
Amiga Mechanical Keyboard - A1200.NET
Amiga keyboard
Tindie Blog | Amiga 600/1200 Keyboard Conversion Kit
Sum adapter enables connecting USB HID keyboards to your Amiga. It has been designed for installation inside A1200's casing. Sum is based upon 16-bit Microchip microcontroller.
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Sum A1200 USB Keyboard Adaptor - RetroPassion Ltd
Amiga 1200 USB Keyboard Interface
HARD MEMBRANE KEYBOARD REPLACEMENT FOR AMIGA 500 & AMIGA 1200 | eBay