Why do you feel it is necessary to heat treat the axles again? Just because you are shortening them? If that is the case and you are only cutting some of the spline off, it is not needed. If you need to shorten them enough that you would need to respline them, I would recommend buying new. Anytime you heat treat something, you take have the chance of movement. ie. warp/bend in the case of your axles. In a lot of cases final machining is done after heat treat so that the required tolerances can be held. And, your local precessing vendors are correct. You cannot heat treat these without knowing the alloy and what has already been done. For a few hundred bucks, it's not worth it. Hope that helps.
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