This was as easy as the I.M.A.S.S. Power Supply that I converted previously.
These are easy to pop open... pull the feet off and then undo all the screws.
Find a transformer of similar size and voltage from your trusted and local electronics store and then swap the existing 110v transformer out.
There's the usual make-it-fit work. The newer transformer had bigger feet and I didn't have a clean way of sizing them to fit. So I removed a bit of the plastic casing on the base of the power pack.
Re-do the wiring... the powercord is fed directly into the transformer. Tie a knot in it to stop any yanking from doing damage. Then solder the two internal wires.
Black is ground (tested this with my old workhorse multimeter.) And that was it... works perfectly!