If you can do without the security of a chip key, I have a cheap solution.

The gray key is a proximity key, which means that it only needs to be close enough to the transponder by the switch to communicate. So, go to your local hardware store and have them cut you as many of the cheap black (non chip) keys to fit the switch as you want. Then pull the lower cover off the column and tape or glue the original gray key in there so that the transponder communicates with that original key. Re-install the lower cover and you can use the cheap (black) key that you cut to fit.

Have done this many times.