Join Date: Aug 2005
Location: Madison, WI
Bikes: Gary Fisher Aquila (retired), Specialized Allez Sport (in parts), Cannondale R500, HP Velotechnic Street Machine, Dented Blue Fixed Gear (retired), Seven Tsunami SSFG, Specialized Stumpjumper Comp Hardtail (alloy version)
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No, that's not how a gyro works. A gyro is designed for the rear wheel and with some sort of on-frame support for the cable housing.
Since you're using a threaded headset, and not a threadless bmx headset, you won't be able to have a front brake and do barspins. The topcap on a BMX headset is oversized and the bolt for that headset has a hole in the center through which you send your brake cable.
Also, good luck finding a straight-legged, threaded 1" fork with brake posts. And a fork with brakes (whether center-pull, or linear-pull, or even U-brake) won't be able to do barspins on a track, touring or road geometry bike.
in short... no.