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You can get high temp sealant for kettle BBQs - it's like weather stripping. This stuff.
You could fill most of that hole with that stuff. I used it for years on my Weber kettle and can confirm it is robust. There are high temp silicone grommets / plugs that you can find for BBQs as well that might work as well.
Aroogah
Unfortunately well outside my capability / beyond the tools I have / have access to! Suspect will have to stick with the crumpled up foil!