I don't think it's possible... I believe the PCM interfaces with the PATS system to disable the ignition in the event a non-programmed key is used. Not sure how you could fool the PCM into believing the key it's scanning is actually a programmed one... not sure how it gets that signal. Sorry.
Your best bet is to buy extra keys before you break the originals... if you have two working keys, you can program additional keys yourself. You just have to have the new PATS keys cut to match the old ones and follow the procedures in the manual. But, like I said before, you have to have two working keys to program additional ones.