Check out 3D serpentine:
http://www.zaxwerks.com/3dserpentine/index.shtml
However, you can also use Free Form for true 3D warping.
You can also get away with having the map layer sandwiched in between 2 film strip layers- one for the part behind the map that cuts off right where the strip curves back, and another for the front of the strip, from where in curves back and comes in front of the map.
Tudor "Ted" Jelescu
Senior VFX Artist