Want DK? There's plenty of systems that have both nomad and DK constructs (I know the two are related, but I'm not sure if the Nomads build their own constructs or just use old DK ones) that no one ever goes to. Like Chester (I'm not sure if the construct there is accessable)... No one ever goes there....
Anyway, the addition of more Alien constructs could have the side effect of making them common place and unexciting, instead of rare and interesting. Personally, I wouldn't risk it.
Yes, the base in Chester has docking, I had to dock there for some time on my Nomad until they fixed Morph ID for weapons, and it was also easier getting from Chester to Iota/99 than directly from the Shrine to Iota/99.
Also, I say add only 1 system that's extremely, borderline impossible for a human to reach, requiring you to go to Iota/99 first, where Nomads are booming and showing that they're not quite dead yet and they're still very dangerous.
Playing as a Nomad, I feel extremely lonely, Nomad spaces are completely devoid of both Nomad players and Nomad NPCs, I spend 95% of my time in Outcasts space to roleplay and have fun instead of Nomad space.