I've been thinking about this same kind of problem for a while now and have an alternative solution. It requires you to have access to a lathe though. The whole problem (allegedly) with using a threaded fork with a threadless stem is that the threaded portion of the steerer is not strong enough to withstand the clamping force of the stem.

On Alpha carbon forks, instead of a compression plug fitting, they give you an flanged aluminum tube with a star nut pre-intalled and tell you to give it to your shop or epoxy the thing in there yourself after cutting the steerer to size.

I don't see why something similar - a flanged sleeve w/ starnut in the threaded portion of the steerer - wouldn't yield the same result. heck if you make it just the right size it wouldn't even need to be epoxied in place as clamping force may keep the whole thing locked together. That way you can utilize the full length of the threaded steerer to acheive a good handlebar height with the usual 10º stems available.

somebody here tell my why this is a bad idea - that's what you all seem to be good at ;p

matt