Robin wrote:
...
ordinary self tappers and then grind/drill/use the wrong kind of
screwdriver on them?

On this theme of incapacitating ordinary screws: use Phillips heads and
put a dab of JB weld in the recess. Digging out the JB weld would be
possible, but very time consuming. Bob

PS - when I told Thunderbird to Send this, I had misspelled "Phillips"
as "philips" and Thunderbird's suggested correction was "phi lips",
whatever that means. Spell correction is not a strong point with T-B.