These keyboards are all built to order, so I'm happy to take requests for changes. On this occasion, I was asked if I could fit a USB hub in the side (instead of USB joystick ports).
No problem. It took a while to find a suitable USB hub with the right spacing between ports, but I found a nice 4 port one. The metalwork is actually from a Commodore 64, as the VIC20 only had one joystick port.
This was fitted inside and hot melt glued in place. Three ports on the outside (one blocked by the metalwork), and one inside for the USB keyboard itself. Leaving a single USB lead from the back of the case.
In use, just plug your USB devices into the side of the keyboard.
Tune in tomorrow to open the final window on the Advent Calendar of USB keyboards. Will it be Ruud Gullit sitting on a shed?
2023 Update
USB Keyboard Controller Kits are available from my Sell My Retro store: