My verdict: Possible, but silly. About the worst "upgrade" you can do. If the frame is 1" and comes w/o fork, you don't actually need to do anything. Just get threaded stuff. If it comes with fork, you can 1) have the steerer threaded by a good shop if it's beefy enough. 2) have a framebuilder swap out the steerer for you. I'd recomend this over threading the existing one. 3) get a new fork