I wonder which Norwegian company has contracted the wet leased aircraft? If they have been contracted through NAN and then the Norwegian parent company choose to bankrupt NAN, these charter companies aren't going to get paid a penny.
If I were a director of any of these charter companies brought in to counter the strike I'd be very wary indeed and concerned that I might not see payment. With the moral vacuum that exists within Norwegian management I certainly would not put it past them to try.