Pack it with dry ice? Perhaps after heating, hoping for differential expansion of the internal mating part, and contraction of the axle part?
Maybe fab a "gear puller", using a piece of tube or pipe large enough to go over the axle part, weld a large piece of all- thread into the axle end, cap the pipe and use a large nut to pull?
Could the seizure be caused by road salt corrosion?
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