Sounds good on paper, but there are several problems there.
First off, when the part is merged into the scene, and you can't see it, try right-clicking and unhiding all the objects in the scene. That usually seems to be the problem for me.
Problems will arise when you are attempting to do this certain thing in the sim. The "refueler" will only move in the direction of the aircraft, so if you even shudder one bit, it will have that same shudder and you'll be able to see it. There will be strange movement with the refueler because of this.
Also, where would you hide this "refueler" when it isn't being used? You can't scale it down to have it appear when you press the button, as FS won't recognize scalable parts. If you have it hidden below the horizon, how will you know how far down to place it? You could put it at 100,000 below the aircraft datum, but what happens when the aircraft rolls? It would be possible to see it (although it would be far away).
You can always try it, but don't expect any miracles.
