Re: nikah validity..
:k: Since OP is in Germany, she’ll need research exactly what German law requires but at least in the U.S…CHOOSING not to consumate the marriage is not an option for annulment.
As for the last part (ie. not intending to live as a married couple)…if OP has filed any type of immigration documents for her hubby…she should make sure this “option” won’t cause her any problems with the immigration officials over there.
And yes, just like you said…even with a legal annulment…the desi community will still consider it a divorce.