Bezel Replacement on iPod 6th Gen

Hello I am fixing a 6th gen Ipod Touch that had a battery expand and the bezel expanded and broke off the display. I have disassembled the Ipod but am running into difficulty replacing the bezel and also one small screw-head has become stripped. I have been unable to find a Phillips head screw this small and am using a very small flat head at the moment. I have a small fixit kit with a PH000 and J000 but they seem to large. I would like to find a small enough Phillips head and know if it is possible and if so how to replace the bezel and tips for removing a small stripped screw-head. I have tried a rubber band but no luck. I also need to replace the battery and bought the 5th gen one by mistake is that OK as well?

-Thanks