I did re use them... you don't have to smash the crap out of them with the vice grips. I re installed the same screws the same way... I don't have the tip your looking for either.... never have. See that's why they call them security screws you can't remove them without the special tip... lol
If someone does have a better idea of removing them and reinstalling them I would love to hear it.
I have seen those exact type security screws on ebay but that's been awhile back. If you find the special tip you more than likely have to buy the screws with it.