Can't help directly but I have some 12 volt power supplies, meant for shop/display use they have the ampage etc for an enlarger (more in fact) and I've kept 2 in case I ever need to modify my De Vere 5108 because the 4 bulbs are too expensive. But these units are quite cheap and plentiful and often get sent to land fill.
There are 12 volt supplys available for powering low voltage lighting which would probably work well, but you'd need to do a little wiring. I redid the power supply for my little Durst using one. Should be easy to find at an electrical supply house. Does the head have a fan, or just the bulb?