Given the fact this is a B’shas H’hack meaning its likely if Halacha is followed to the letter of the law, this couple would either not marry (and live together) or get married in Cyprus. Using the Aruch HaShulchan which forbids it doesnt really make sense
People who are not relgious and maybe even hostile to religion, you cannot force them to do something, you have to try to coax them and find B’di Eveds