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When you say hardened, it is "skate a file" hard, "knife" hard or just "harder than mild steel" hard? Beyond that, how are you coming to the conclusion its hardened? I'm not trying to be insulting, just curious at the process, file test, is it hard to drill or cut, etc?
At any rate, if it is fully hardened, annealing isn't too hard, least not for simple carbon steels like the o1/2 family. Get it up to critical temperature, round 1500f, then cooling it slowly. You don't need any special equipment, sticking the bar into a hot charcoal fire and letting it burn itself out, then cool in the ashes will do it. Won't be a perfect spheroidal anneal, but it'll do more than enough to make it workable
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