I just had to do this today shooting video. I guess I'm not great at setting WB, don't have a card, seem to have problems with custom WB sometimes in PP etc... Usually I do OK, but today I was unsure and had the idea of upping saturation momentarily to check. Worked well and something I think I'd do again.
I'm at least going to create a custom picture style as sergiocamara93 mentioned.