I just took his advice to straighten the machete myself ( I have others to do as well ) and this is what I used.
I took an old drilling hammer head that I keep around as a small anvil like surface ( the faces are a bit domed ) and clamped it in my bench vise.
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Then took my favorite 14oz ball peen hammer to it, you want a good ball peen that has a domed main face to it.
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at least I believe that this was the key to my success here, experts may advise otherwise.
To be clear I did not use the ball end of this hammer, that would just leave little dimples and probably do very little to straighten anything.
I do not have a before or after picture because my phone wouldn't focus on it, but this machete was warped multiple ways going down the spine.
It is a tad wavy at the spine now, but the blade is no longer bent in any direction and the edge is straight and centered.