If you don't want to book AirAsia because you think you can't change or cancel the ticket without a refund or fees, then why don't you book a different airline with a fully refundable ticket? Almost every country requires an onward ticket even if the immigration officer doesn't check for it most of the time. But you will have a problem if by chance they do ask you for it and you don't have it. Simply book a fully refundable ticket, carry a copy of it through immigration, and then if you don't want to use the ticket, cancel it for a full refund.