i have one bent wrench i made with a brazed on steel pipe handle for the bottom nut, then use a regular wrench diagonally on the top nut. his A turbotorch (with the air inlets) burning MAPP gas could probably get it hot enough, maybe even the propane. the oxy acetylene torch gets a hot flame, but when you just need to get something cherry red, the concentrated neutral flame is too hot to apply directly, it is for melting metal to weld it. To just get something red you would back off the flame. I would say try the propane, if it gets it red, it should be easy enough to bend with a vice and pliers. I wouldn't worry too much about strength since you're not torquing it like crazy.

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83 240D four bagger stick diesel 276K