I got it. Worked exactly like I said. Cut the existing ground to rear fog and used the hot wire from the reverse light. Because it's a ground when not used. And two hot wires to a bulb doesn't hurt it, it just doesn't light up. Now it shuts off completely when reverse is engaged.
I used a similar setup on my BMW side markers. Stock, they only turned on with blinker, off full time. So I cut the ground to it and spliced it into the front turn a HIGH filament wire. So now not only did it stay on full time but it flashed alternatively with the front turn. Tried this on Z but LEDs are a different animal. Didn't work.
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