Hide-a-key for a push button start

I have search all over for the answer for this. I have a 21 TRD Pro with push button start. I am really wanting an option for spare key that is not a smart key. It appears the immobilizer has two different mechanisms that allow the truck to start; the RF transmitter in the wireless key and a normal chip embedded in the remote that can be help up to the push button to start the truck when the key battery is dead. Has anyone tried to program a "G" or "H" chipped key to a push button start? Looking at pictures of the circuit board, there is a strong possibility that Toyota just put a normal key chip in their remotes as a backup for the dead battery situation. Any experiences or circuit diagrams of the key fob out there?

 

Don't know if it helps but I recall reading a post about a credit card key that you program. I think it's off a Lexus. I'm sure searching on here you might find the post if that's something that would help.

 

Just take the battery out.

 

You can turn off the fob, and stash it on the truck. It's what I did.