How can I correct for 2 different color temperatures in one image?

Hi,
In indoor architectural photography one may encounter mixed color temperatures in one image. If one could use gels and lamps to replace incoming natural daylight and force a uniform color temperature (for instance tungsten) then the problem would go away. Yet, sometimes this is not possible or practical and I was exploring what could be accomplished within Photoshop. Here is my proposal ( or beginning of it):
shoot RAW
generate 2 versions of the image, each corrected for one of the color temperatures present (say WB dropper in "should be neutral" area where daylight dominates and another WB dropper in "should be neutral" area where tungsten dominates)
open them in Photoshop and move one of them as a layer on top of the other version
Try to blend the two layers
in one example, I used Hue blending mode and the photo fixed itself!! However this is not generalizable to other images
I also tried BlendIf for harder images but with no success
I presume selection is then a must which brings up the question:HOW CAN I SELECT DEPENDING ON COLOR TEMPERATURE? I mean, the layer where WB = daylight looks orange-casted in the areas where the main light source is tungsten, while the layer where WB = tungsten looks blue-casted in the areas lit mainly by sunlight. I must believe there should exist a best approach to select say the blue-casted areas or the orange-casted areas, and that approach should be simple if it somehow takes into consideration the predominant cast. I have tried Select Color Range but not very successfully. I just feel there must be a simpler way, taking advantage of the present casts.
Masks seem also useful
All feedback will be greatly appreciated!
Thanks,
Juan

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How can I correct for 2 different color temperatures in one image?

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