Then I noticed this on fleaBay:
eBay - Amiga mouse adapter
I've asked the seller if it will allow the wheel functions on most mice to work, but he mentioned having to wire up the joystick port to the header-pins on the mouse adapter to get it to work...
I can confirm I have one of these adapters bought from this seller on ebay, I can also confirm that wheel-scroll-action does not function.
However the adapter itself is very reasonably priced and works well without any software installation required.