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@photodiarist
If the wedge is not the cause of your problem, and the stem is really seized badly, and you're not too worried about damaging the handlebars (or you can remove them and replace with something you don't care about) you can try using some WD40 or similar then bolting the fork to something stable or a crap wheel that's wedged between strong legs and then wack the end of the handlebars with a 2x4 piece of wood to make them rotate while the fork stays still.
Once you've got the handlebars rotating just keep using brute force rotating back and forth with a bit of upward lift and eventually you'll get the stem out. This is much easier with a second set of hands.
Good luck, and do post about your solution when you've resolved it - I'm curious to know what option worked for you!