I would have liked to talk this with Bomb. I mentioned this in a E-Mail, but he didnt answer even if he has plenty of time after finishing college... But I will try. I am no professional writer, just a idea giver.
As I said, the last humans fled to Emalghion and gave all their info on colonizing, etc. So using this new colonization capablity they will colonize some uninhabutated worlds. They would be in a area between DSN-1810 (most remote UE outpost), and Leiton. So it would be DSN-1003, DSN-9608, DSN-4846, DSN-3133, DSN-4386, DSN-8619, DSN-1154, DSN-1903, DSN-4533, Smott, DSN-3930. And just because these four systems are 2 jumps in either direction from Kelmaon, these too: DSN-1469, DSN-8209, DSN-8200, and Holmm. This would be ideal since it makes sure anything to not do anything to DSN-1810, and doesnt take any systems Miranu. It takes also 17 systems, which is the exactly the same amount UE has at start including the frontier outposts and Huron. If we are in a ROTV setting, this makes it easy for Emalgha to strike at now-Voinian outposts and Sol. If you like a EVO setting, colonize Ji Nebula. Because UE is a ally of Miranu after the Diplomatic Relations mission, the last humans would present them to Miranu. They would then give them the Nebula Penetration device and tell how to colonize planets. This is not used in the stock scenario, but we could say the Miranu learnt how to do it after the end of it, finding F-25. Ofcourse, F-25 should not be colonized because it would conflict violently with Bombs plug.
Whew. That was a really well thought- of post. I downloaded EVO Complete Map, looked in the empty systems just under Miranu, hand counted the amount of systems. I added the 4 systems near Kelmaon, added Emalghion and Kelmaon, and compared to the amount of UE systems. I wrote down the names of the systems, so there wouldnt be any possiblity of confusion, and revised parts of my post several times. Took several hours including looking of map.
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I am eager to try to ansver mission questions