I just have a regular key in my wallet in the coin pocket. Just have a cheap one cut, does not have to be a transponder key. Just something to open the door. Put it in your wallet, check book, purse, makeup pouch, whatever. I usually always have my wallet anyway.
But I only use my remote to lock my truck. So even then it would be hard to lock myself out. But you never know. And I do not have a keypad, but I am looking at the RF Keypads to put one on my Expy. I use it for work sometimes. And I just leave the key in the ignition the entire shift, take the remote off and hook it to my gun belt, and use that to lock and unlock the doors.
I also only have one transponder key.
