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I'd start off with clamping it to a solid, flat surface for a day or two. If that doesn't work repeat with a shim in the centre of the bow so that you're bending it past the resting point. You're unlikely to get it 100% but should manage most of the way there. I can't guarantee that you won't crack the new finish.
I'm guessing it's going to be difficult to persuade it to straighten out without some combination of heat and moisture? It's about 8mm out over the 2m length.