22. Where the person to be served is in Cyprus but is under disability, or where for any cause personal service cannot, or cannot promptly, be effected, or where in any action, whether in rem or in personam, there is any doubt or difficulty as to the person to be served, or as to the mode of service, the Court or Judge may order upon whom, or in what manner service is to be made, or may order notice to be given in lieu of service.