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Chaley
lynx
Might be better to reply @Light_EDDed not me.
The bolt is not siezed in, 'just'overtighten. So looking at ways to get the bolt out. So welding a bolt in the drilled hole will either get the bolt out or break the weld or break the bolt. Even if the bolt breaks easy enough to remove.
Personally I'd try widening the hole with a drill, to make the hole conical and hammer a torx bit in. So the edges get some bite in to the bolt. Using an impact driver will hopefully give it the incentive to move.