"it will have to be a grinder with some kind of 36 grit or an actual grinder"
The floor sanding folks have 36 and 24 grit silicone carbide that is easy to stick to a thick sanding pad with sanding disc adhesive.
Cut it square the corners will help in not digging into the deck.
FAST ! but use with great care.
Paint remover is also made for aluminum .
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