And as you're finding the "security" torx and allen bits are not all that uncommon these days. So their "protection" value is greatly diminished. A recent all in one driver handle and bits kit I recently got has both the allen and torx bits already drilled out to fit over the security pins. This was a counter top cheapie promotional at the local autoparts store.
There are other more protective security screw heads available but most will not allow for decent torque loads or are one way only which makes it extremely hard to service your bike later on. And as mentioned getting them in metric can be a pain.