Is there a way to eliminate or reduce the size of electronic key fob for cars? Specifically I have a BMW and a Dodge and both no longer use keys. They have the electronic key fob for locking and unlocking and they are proximity types that must be in the car to start with push button starting. I would like to find another way to have the function without the key bulk or maybe an alternative such as a watch or watch like attachment. Maybe a RFID type card I could keep in my wallet. If not how are people carrying multiple key fobs?