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Sounds a lot more like a lighting balance issue for the OP.
I've never seen a need of "averaging". You just pull it back in post for the subject; assuming it's been illuminated with the flash. One would still revert to the flash's kelvin... that being 5500, or whatever gel you used on the flash.
Adjustments in post beyond that are up to artist's interpretation. (warming, cooling, etc.) If you're using the same flash/subject setup (including light balance and exposure) in different rooms, your WB should remain constant for that flash/gel. If you're changing gels/subject lighting/balance, then you change WBs as needed.
This is Photography Common Sense 101. Seems like there are a lot of people here making it much harder than it really is. That leads me to believe many do not pay much attention to actual balance of light. AWB is usually the way to go, unless you gel. If the cam knows there is a flash, it will default to 5500. If you're running manual, then set manually. If you've added a gel, you need to set that manually as well.
This is really basic foundational knowledge.
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