Massive public education campaign, as is routinely done for many other topics found objectionable by various religions but acceptable in secular society? From birth control to blood transfusions to interest on loans?
At minimum, show the non-religious benefits of doing (or not doing) a thing and why it is relevant for the individual. Don’t punish the victim for doing the thing; if someone must be punished, make it the person imposing the action.
That's only slightly better than getting a fine.
If gov would run a ad campaign / school program with "making women wear burka is bad" then the victims would still be the ones to suffer because it's still directed at the way of life as they know it.