The answers you got the first time you asked haven't changed much:
sandyfortner wrote:since you are potentially hiking up out of Yaqui Canyon there could be a situation where you would be cliffed-out. May also be a little more difficult to get a shuttle in that direction.
Sredfield wrote:From there the southern terminus would be a bushwhack of nearly a mile and up 800 feet. The trail will be quicker, less uncertain, and much easier, not to mention what the border patrol may have to say about random off-trail pedestrians in the area.
keepa wrote:As for border patrol, I am sure that would be no problem once they see that you are a hiker.
Since the track you drew in Google Earth goes into Mexico quite a bit, I feel like you might be surprised by the reaction of the officers whose job it is to prevent you from crossing back over.
If you look at the satellite view, the road ends where the fence ends. The reason the fence ends is because the natural topography is extreme enough as to not require a fence anymore. Can you scramble up a trail-less hillside made of boulders and small cliff bands covered with cactus and prickly desert plants on a steep slope equivalent to 1000 feet per mile? Yes, I'm confident you could make it. But I'm still not sure why you would bother trying. There's already a nice trail built exactly for the purpose of getting to the spot you want to go!