Lets try this again. You do not need a transponder to fly in a TMZ. If you do not have a transponder you request permission to enter by radio, which is almost always a formality. Alternatively, you can operate under a letter of agreement. In this case you would be based or visiting an airfield inside a TMZ and would obey the procedures in the agreement with no need for radio contact. It is perfectly possible to routinely operate in a TMZ with no transponder and many micros do this all the time.
Rod1