I'd determine if it's even worthwhile before I determined whether or not it's feasible. It's going to be some flavor of 1" threaded headset, I'd think, with 26" wheels and cantilever brake bosses. So you'd need a headset that fits into the headtube, and has the same fork crown race diameter as the new fork, with the right steerer length, along with whatever other stuff you'd like to change.

Pull everything off and weigh it to figure out how much weight you can save. I remember being surprised that the steel bullmoose handlebars on my early Ross weren't really all that heavy, worked fine and looked really good. Maybe a new stem and handlebars would work out okay for you, or a stem adapter, stem and handlebars.