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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.
tc
MrE
souldoubt
Aroogah
Cut a square piece of steel to put behind the holes and put two nuts and bolts through the bottom holes and drill a hole in the middle of the top hole and use a dry wall/plasterboard anchor for the top hole and then cut down excess boltage? Think they are called this: Spring Toggle Butterfly Bolts - all will involve a metal drill bit.