Alternate Method
Hey, I don't mean to put you down, you did a great job figuring that out and it will work perfectly that way, but there is a much simpler way to accomplish this.
You can cut the blue/yellow wire going to the rear fuse block, and wire in an on/off/on rocker switch. Here is a crude diagram of how I wired my NPP.
When you're done, the 3 positions will be flaps Closed/Open/Normal.
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