I think this part of the docs is of use to you if you want to manually manage when assets are loaded.

Typically, this is done by creating a shared reference point (say, a center point on the ground) and then animating both of them relative to that reference point. If you start this animation when the actors are not in the right relationship to each other, you have to first move them there – e g, on…

@all8up That is right! How did I not think of that. I can just delegate this to the Physics system. That's how UE4 must be doing it! I have recently integrated Bullet Physics into my engine so yeah I think this will work fairly easily now.