You might try loosening the torx screw while "prying up" on the screw from the underside to put tension on the well nut beneath. This has worked for me on occasion, but be careful not to damage the windscreen. A "forked tool" you can make with a die grinder or by grinding flat/thin an an old small open end wrench may help prevent "sideways creep" as you turn the torx.
Hope this helps.
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