If you're thinking that you'll save significant time by taking the shortcut, you're thinking wrong. For about half of its length, Lubken Canyon is basically a 1-lane (not 1 lane each way; 1 lane, period.) Pavement isn't great, you'll be going at most 25 mph, and, if you meet another adventurous driver like yourself who's headed in the opposite direction, getting past each other will take some effort.