I got lazy about linearizing small changes to WCS (especially since images that are near the celestial poles are nightmares), so I coded up (but have yet to test) a WCS tweak code that takes no derivatives at all—a Markov-Chain Monte Carlo code. I am sure there are a million reasons this is a dumb thing to do, but I can do it, so I did. Debugging and testing will be left for tomorrow.
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