Answering my own question
Okay, my momentary despair has passed, I've done some research, and I will answer my own question in case others find this post and are in similar positions. The key should be removable, and easily replaceable, and cost like $6, instead of the $600 I feared for a new crank assembly. That really would have been a shame considering I JUST rebuilt the top end.
To remove the key, you can tap on it lightly with a screwdriver to angle it around so that you can pull it out with pliers... or so several youtube videos and e-how article say. I haven't tried yet, but given my luck, it will be really tough to get out. That said, I feel like I should avoid hitting it very hard since that force would be translate through the crank bearings. I will report back with my success and/or struggles.
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