My daughter owns a repair shop (brooklynlutherie.com) and she has a chunk of oak - about 2-1/2" X 2-1/2" IRRC - that she uses with a heat blanket available from the supply houses. She uses a thin shim at the ends, depending on the amount of bend, to over-straighten (1/8" or less), and clamps it all together, brings it to full heat for a while, then lets it cool before taking it out of the clamps. She finds that those with hide glue seem to work better than other types, but all work OK. With much bend, she also finds she has to fill the saddle slot and re-cut it for intonation.
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