I got an NOS European headlight off eBay for the cost of a pair of OEM 45/45W bulbs and it came with A set of new H4 bulbs.
Sweet deal! You guys who scour eBay continue to amaze me at the deals you find.
I suppose if you had the patience the headlight assembly could be removed and the socket Dremeled to accommodate the Euro H4 bulb. In fact I thought somebody here did that with a 1300 headlight.