I'm running the double stem trick on my tourer, but I'd had made the conscious decision to leave the steerer long so I could get another stem i there.
On some other bikes, especially the moustache equipped one, I've had good luck with this Nitto mount. You can sub any length bar into the clamp. You can also get two clamps and have an entire second bar mounted in front of the original.
This is Africa, 1943. War spits out its violence overhead and the sandy graveyard swallows it up. Her name is King Nine, B-25, medium bomber, Twelfth Air Force. On a hot, still morning she took off from Tunisia to bomb the southern tip of Italy. An errant piece of flak tore a hole in a wing tank and, like a wounded bird, this is where she landed, not to return on this day, or any other day.