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Spazola (Charlie) posted some time back how he straightens tangs by first softening them. I think it was a video. The tang really doesn't need to be hard, so you could go that route - then you could use a file for jimps. I have used heat block paste when I soldered a bolster on a knife. Somewhere a long time ago I read you can stick the hardened blade in a potatoe to keep it cool. Not suggesting this without a test.
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If you want to soften it first then there are many other methods. Some time ago I have seen Stan Shaw using knurling wheel to make jimping on his knives. And it is something what I am planning to try once I get myself together and make a blade. Another option would be cut it like old file makers used to.
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I use a Swiss checkering file prior to heat treating.
Some knifemakers use a threading file - which is much less expensive and has the advantage of 8 different tooth per inch sizes in one tool.
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Yep checkering files here also but only pre heat treatment
No good post HT
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Simple triangular file, patience and practice. Checkering files don't fit in notched areas