I'm a member of the KFC forum and I think that the latest recipe posted by the guy who runs it and calls himself the colonel is about as close as you can get to the original colonel sanders recipe, however that is not what KFC corp serve up today in there stores, it is much more tasty than that.
As for a domestic pressure fryer they are very rare , I have only seen two current manufacturers and they are expensive at 300-400 pounds, many of the members of the KFC site buy twenty five year old models from the U.S via ebay and pay around 30-50 though these could also be a safety factor, as for using a regular pressure cooker it is highly dangerous don't do it.