I also have various single and dual 9 way D to USB joystick adapters that would fit nicely in the A600 or A1200 cases. These allow you to use original 9 way D joysticks (like Zip Stik or Competition Pro etc.) as USB joystick devices, contact me for more info.
If you want to support this blog, you can donate via Patreon or Paypal, or buy something from my store.
USB Keyboard Controller Kits are available from my Sell My Retro store (LED cables no longer included as no one appeared to use them):