This is written assuming you are installing handlebar risers.
I recently bought an 08 Goldwing and had the selling dealership install the Kuryakan bar risers. I don't have any info for you on disconnecting the plug and I'm not sure in what specific position the bar risers are set at (I had them set the position for a rider about 5'7"), but be forwarned that upon my initial attempt to lock the forks, I could not get them to lock because I couldn't turn the forks to full lock as the two cables above the right handlebar hit the faring and prevented the bars from being turned to full lock. I played around with it a bit and found if I carefully grasped the two cables above the right handlebar and pulled them up as I simultaneously pushed the bars to the left and pushed down on the key as I turned it to the lock position, I could then turn the handlebars bar far enough to allow the mechanism to lock.