I’m also from oberlander background. It is not Chassidish but not litvish either. It is sort of a blend of hungarian and yekkish. My grandfather wears a litvish levush but davens with a havara similiar to chassidim but with a touch of yekkish.
I think it is virtually extinct at this point so many “became” chassidish. Look at Mt. Kisco. that is a real oberlander town and yet the people there pretty much became chassidish because nowadays you have to fit into a certain group. If s/o asks you if you are chassidish or litvish and you say oberland, they will have no clue what you’re talking about.