What does your girlfriend want to do?
It seems that she is the one most likely to be affected by your decision . If she is really committed to the relationship then it is up to her to be brave and face the music.
Carry on the relationship. When ready, get married. Work towards joint reinstatement if you must, then fade away so you can speak to your Inlaws.
Reminds me of a girl who was seeking re instatement at my last congo. She had been dissed, married the man , got her reinstatement . We never saw her at meetings after that.