The X50 was designed for tactical and military radios. It was not designed to interact with civilian radios.
But there are aftermarket adapters available for the X50 on eBay. You can buy a radio adapter with the Motorola pin configuration for your radio and the other com in can be a single-pin audio adapter designed for phones/iPods. No guarantees they will work properly of course, but might be easier than trying to reconfigure and resolder pins. They seem to be available for most of the popular professional or toy gamer radios.
The X50 seems overkill for film sets. I wear a surveillance headset with an ear mold so I can also hear ambient sounds. If I need an audio feed from a Comtek, I use an ear bud or headset over top of the surveillance ear tube. If I am doing gunfire, I use an electronic headset over top of the earpiece. It works fine, especially with gel ear cups.