Techniques I have used many times (eBay cars) is ...
An imperial driver such as 1/16 will sometimes fit a knackered metric hole
Torx driver 9 or 10 I think?
Cutting a slot in the screw and removing with flat head, will leave 2 small marks in chassis but at least car can be repaired
Have you checked that you cannot remove all surrounding screws and twist the part it is threaded into, ie bulkhead screw
There is an old tale about using solder to go hard in the screw and using that to remove but I have never tried it.
You may need to heat up screw if it is heavily thread locked
Twisting the affixed part is easiest of all choices if possible.
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