Well I think Friehaven is partly non-ethnically German. Have a look at Randy's article about it at the Tirane Sourcebook...
http://www.users.globalnet.co.uk/~dheb/Tirane/Frei/FreiDemographics.htm
I'm glad you like it.
Well in 2300AD all the Bavarian colonies except Friehaven and Heidelscheimat are still German. But I don't think Germany ever had any plans to conquer them, it was just annoyed that they didn't join the reunified Germany like the other colonies.
That's true, but the whole Bavarian colonial project really hit hard times when Bavaria was absorbed into Germany. I think that the Germans were lucky that Neubayern, unlike Garten, didn't have an active nationalism of its own.
But Heidescheimat and to a lesser degree Friehaven has been paranoid about a German invasion since the WoGR, and other countries excluding France have distanced themselves from the issue.
One thing that I plan on including in the expansion/review of Freihafen is a description of how Freihafen's independence got recognized. For the Third Battle of Alpha Centauri, I'm relying heavily on the Ten Day War, Slovenia's war of independence, where nimble and media-savvy separatists staged unexpected assaults on incoming federal troops and were able to secure international mediation that let ultimately to Slovenia's independence.