Someone posted one of these a while back. Hitchsafe. Cancels out the signal on the transponder key. My key won't allow it to be locked in the car. If i have my bike rack on the hitch, I just put the key in the Hitchsafe and leave in the car locked inside. Take manual door lock key into the water. Alarm goes off until I can open it up and get the key out. Annoying but works.
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I've been using this on my Tacoma for years. So far so good.