The donut can be fine but keep in mind your ankle articulates forward and down. That means a donut may need to take that shape. The last thing you want is flexing and the screw hitting the edge of the pad and concentrating the pressure in one spot and hit. Punching out the shell may be necessary in the end and can be pulled back in with heat if and when the screw ever gets removed.
Barring that going to a good shop and having them file it down could be fun. Can I watch?
It's not so much the model year, it's the high mileage or meterage to keep the youth of Canada happy
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