Threaded headsets come in 1.125 varieties, but the quill stem might be harder to come by. I haven't threaded a steerer in a while, but I think there's not enough material on a threadless steerer to get a good set of threads. You could probably find a NOS fork.

They'd be big, clunky MTB-type parts, and thusly "ugz", unless you wanted to pop for a Campy or King headset.