Here's what I've done, and I've done it with wood about as twisted as that. Make yourself a caul. I used a 2 x 10, used an old Bear Cub for a template and cut a curve in the board. Then, I simply clamp the wood, back side down and heat bend the wood with a heat gun and mineral oil. Takes a little imagination and some time, but I've always gotten a bow out of it. You may need to over bend the end farthest in your pics to make this work using other methods, like hanging a weight and heating, prying it using a vise, things like that. If it's firewood unless you fix it, you've got nothing to lose. If you want, I'll take some pics and email them to you showing the caul.