The thing is, with all the pre-processing we do on our images, I feel it is rather unecessary to have to change white balance, etc., first, because we can make all relevant changes in post processing. And, this is coming from a a purist -- you can read my rants against using Lightroom/ACR over Digital Photo Professional elsewhere on this site.
Having said that, when dealing with Canon RAW files, if you really wish to, you can make your edits to a RAW file, and then re-save it as a new RAW file, then, send that through to your pre-processing software; in this case, DeepSkyStacker.
I often do this with my landscapes where I need to blend certain components from the single RAW file.
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