If you want to bring the AU Draenor to the current setting, why don't just bring the whole planet a la Argus, but permanently? it doesn't have to be a landmass on Azeroth, is just has to be easily accesible.

Personally, if we ever bring the AU Draenor to our present timeline, I hope they make it crash with Outland, creating a new, Draenor 2.0. We wouldn't just have the Tyranny of the Light, but also the conflict with the Outland denizens seeking to thrive on a planet now made whole.