I've been in the area trying to pin blueprints and max rep with these engineers:
Unfortunately, to learn about them, you had to get rep with engineers in the bubble. So, I'm not sure what you can do if you haven't already done so.
To get invites, start doing bounty missions and stuff for
Colonia Council. Ultimately, you'll need rep with them to get to Mel Brandon (as well as 100k of bounties). Hopefully, you can pick up some Osmium mining missions to get rep with them and be able to turn in 10T of the stuff to Marsha Hicks.
Etienne Dorn is a creepy jerk, and you will need to be as well by giving him
Occupied Escape Pods. To farm those, look for a Distress Call signal near the first planet in Luchtaine. Get a hatch breaker limpet controller and a collection limpet controller, go to that distress call and you can farm OEPs from the escape hatch on the neck of the megaship.