Greetings. It is a very entertaining read. Controlling the merger of two (02) galaxies is something that would require a vastly higher level of technology as you put it and even then the risks would be many... Fortunately for us (those of us alive today), the merger of Andromeda and the Milky Way is so far away that the effects of an event of that magnitude will not be felt. In the event of such a merger being close to this time, we would not be prepared for it at all. A great fiction you have given us.