A question about Nikon D3400 DSLR camera regarding beamshots (LED and / or laser)

I am wondering about the Nikon D3400 DSLR camera's white balance settings regarding the beamshot of either nearly monochromatic LED flashlights and / or lasers; is it best to edit the white balance on the computer via RAW (NEF) file (Darktable on Linux computer - similar to Photoshop), or just mess with white balance settings on the camera itself?

Lastly, is it worth it going with Adobe color rendition or stick with sRGB? (Yeah, I know, I am beating a dead horse on that topic, but I just wanted to be sure so I don't waste my time and precious space on the SD card - faster SD cards aren't cheap, and my camera's apparently fussy about SD speed as far as HD camcorder mode and pure RAW capture are concerned.)

* I have been taking astrophotography for a while - here are a few examples below. However, I usually do RAW file editing on astrophotography images - is it safe to assume that the laser beamshots should be treated the same way as far as ISO and color balance on RAW files are concerned?

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