Just buy a cheap onward ticket to anywhere mate... don't need an actual return ticket.

To somewhere like Hong Kong. Just to cover yourself.

I wouldn't think there will be any problem at the airport, as I can't see that they would check the far end of a fart about your 13A. Ask them for a Balikbayan stamp as well... belt and braces. (Remember to have your marriage cert handy) .

Sort out any late reporting fines and stuff once you're in-country.

Best of luck to you both.