Don't use torx. Use the security bolts. (looks like torx star shape, but theres a little thing in the middle.) It basically makes it so you can't use an allen, phillips, flathead, boxend, on it. Nothing really fits in it, except the specific driver.
at which point, you'll also have to go buy a new set of tools to use those security screws. As i recall, not too expensive, but still more tools that you may rarely use.
Security torx bits are the Ford favorite. They are all over the interior as well as things such as holding on the MAF sensor to the housing. I don't know anywhere to buy the screws though.. I always had a hard time finding the bits.