If this planet is in Nepleslian space, it doesn't seem to make a lot of sense that it's been colonized since YE 30 (IRL 2007-2008) and no one noticed it or interacted it with it in any way. Basically I'm trying to express is that what you're doing is asking for a retcon on the number of planets and star systems Nepleslia possessed during the Second Mishhuvurthyar War, etc. You're asking for me to say the colonization of new Bernese etc happened when our collective canon right now is that it didn't.
Is there some better way we can proceed? Instead of adding a new star system, is there some way we can take the history you wrote and apply it to some underdeveloped, but already existing, Nepleslian star system?