"How 'bout one to take everyone straight to the OB? ^_^"
Gosh, we don't need a time machine for that. We just need to approach light speed. Special relativity kicks in, we "travel" forward in time... boom! No need to worry about how to travel backwards at all. And this way, we know it will work!
Now, the only logistical problem is finding a near-light-speed capable starship between now and when Open Beta actually WILL start...