easy question with the answer of "Complexity" in this case no all roads lead to Rome! In theory, if you were fused within your bodies past and you know it's no impossible because they said, leaving one's body was impossible and here we are today talking about such things. If you perpetuate in your subconscious mind when separated from your physical body and determine to do what you ask, it will happen! I ended up in my doppleganger's body on some other kind of earth like planet in another solar region of space. Of course I was using the Super Beacon and their location cd's. But if the super beacon is able to send you to such things, it wouldn't be all that hard to do when you out and consciously aware of yourself being out, then proceed with all focus and you will be placed into the body of your "past" really its not your past because you are still reliving the present what you would desire to do.
It will bring something different but not against your subconscious "will"...The subconscious mind is still a mystery of many islands in the seas of the unexpected! What you may want consciously may not go as directly as planned because your subconscious mind knows better than yourself. If it is meant to be it will for sure and you will be better for it.