dudu,
That frozen ATPL you have is JAA one? If so, you can do it in any JAA country. But if it is a matter of cost you can do it in the USA, and, providing the simulator is JAA approved, you can have a JAA TRE sit in on your check ride. Then you will have your B737 type rating on both licenses. If what I`m saying is wrong, please correct me anyone.