Might try shooting some penetrating oil "PB Blaster" in thru the top outer bolt hole.. trying to lube the remaining threads of that bottom bolt. If you can screw the bolt back "in" it would be even better as you'd be able to oil up more of the thread.
If you can weld (or have access to someone who can), weld a nut onto the stripped Torx and spin it off with an impact wrench.
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