Find another way to shape the handle, that angle grinder is creating far too much heat. If you did find a glue that could take more than 600 degrees then your handle materials would likely start to burn or melt so a higher temp glue is the wrong way to go.
Get a cheap belt sander and use fresh belts and you'll have much less heat. If you can't do that then do it by hand with a good file and some sandpaper ....
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