Save your track layout as an element, but take it from like the start of the drop to the final brake run. Highlight, save as an element, and delete that portion because you are gonna put it back in. (Remember you cannot save as an element unless the track is unconnected.)
Then put that element into a new file in the editor, save, and run THAT through the AHG. When you are done, save, and insert that element back into your original file.
IMPORTANT: Be sure to make a backup of your track to fall back on should something get hosed.