Try heating with a MAP gas plumbers torch. Nothing else DIY will get it near hot enough.
If still no joy use a die grinder to shave the nut away. If you're luck you can drive off the out shell of the nut once a face is ground off.
It's like tunnelling out of jail. It takes time. Keep chipping away
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Did some trips.
Rode some bikes.
Fix them for a living.
Can't say anymore.
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