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The wedge is still in there (loose).
Can you wrangle it out the bottom of the steerer? If you do that then you'll have a clear run at the bottom of the stem.
Looking at my post above I'd say use as many spacers as you can between the nut/threaded race and the bolt so that you're working on the threads as far down the fork as possible. It might not matter if those threads get a bit mashed, but you want to keep the ones at the very top nice and crisp.
Great idea.
The wedge is still in there (loose). I was planning to hit it downwards to break the bond then kind of fish it out afterwards. This sounds much better, Thanks!