Assalaam walaikum,
Once again...why are these sisters going out alone? If you want to repeal the law you have to mobilize.
Individual acts of defiance do not produce results. We have had this discussion. And once again..what is being gained?
I would ask the sister this question: Sister, how are you serving Allah by going out alone in defiance of a law and you know the consequences. If you cover to this extent sister, you should not be out alone among kuffir men. You can not have it both ways.
Why are you placing yourself in a position to be manhandled. The kuffir men are going to touch you and pat you down. You will be stripped. You will be photographed and fingerprinted. They may even do a cavity search.
If the sisters, a group, were to go in niqab and feed the homeless it would serve a better purpose. Call the media ahead of time, have a lawyer present, and ask for the company of your husbands to protect you. It is critical in Islam to do good deeds. Feeding the poor is mandatory. Put a different spin on going out in niqab.