I don't know where you're getting the idea that the Armstrong mod somehow creates a kind of long distance humbucker. It does not. Humbucking relies on having two coils wound, or wired, in opposite directions relative to each other. The ac current induced in one coil is 180 degrees out of phase with the equal or near equal current induced in the second. The two signals therefore cancel each other put. If you connect two identical pickups, the coils therefore wound or wired in the same direction as each other in parallel or in series, the effect will actually be to increase hum, not defeat it. Moreover, the Armstrong mod does not produce the same audio tone as a proper humbucker concentrated at the bridge or the neck, so thinking you create an HSH guitar audio wise is misguided as well.