can we have someone in tehran do the payment by chinese embassy in there or what?

HI , i leave in Mashhad and me and my wife have invitations to a conference held in December,as its difficult to travel to tehran to hand the applications to the chinese embassy we decided to directly post them to HongKong,all the documents are ready except for the payment which has to be in BANK DRAFT or CASHIER ORDER,what options do we have for that since there is no connected bank in Iran for obtaining Bank Draft for HK embassy?can we have someone in tehran do the payment by chinese embassy in there or what ? please guide us .thank you