PRESSlite, the manufacturer of PRESSlite VerteX flash light modifier, released a special report that describes a technique to address problems related to mixed color temperature situations. The company suggests making custom inserts for the PRESSlite reflector to match colored ceilings or walls. PRESSlite Vertex can accommodate up to four different inserts, so, in theory, you may have color correcting inserts for four different settings. This, of course, requires some prep work. Here are the steps PRESSlite suggests to color match a ceiling:
The report ("VerteX The Sky Is Blue") is available in PDF format from the PRESSlite download page.
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