No, it is not possible. You would have to know some severe coding to edit the fhm. files in the main maps file because you would need to have a portal to the map. Adding a single fhm. file wouldn't help. But I could see if it is possible.Yup, the code for the map is encrypted so NOBODY CAN TOUCH IT. It's for a reason though so no hackerz can come and mess up the game like what they did with Impressive Title.
EDIT: Not possible, I looked in the Podium fhm map and man, god. Take a look..