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@GreatSince78
Is it definitely the throat of the stem that's seized? Can you remove the stem bolt ok and is the wedge moving freely? Youve probably tried this, but if it's the wedge that's stuck I've found unscrewing the bolt so it protrudes above the top of the stem but is still screwed into the wedge, then hitting with a plastic hammer freed stuck stems. If it's the former and the alloy stem and steel steerer are actually siezed then the other methods mentioned above sound like your best bet, or there's always this plan of attack!
https://youtu.be/7GvN7w386U0