Color temperature doesn't matter unless you are doing work that requires it to.
The natural world doesn't need accurate color temperature - the film gives you exactly what color was there based on the light reflected and its proportion, with some characteristics of the film included. Whether a "white" looks "white" (reflecting all colors in equal proportion) doesn't matter whatsoever when you are trying to capture the color of the light actually reflected from your subject. Seems obvious but I have seen people ask about using a blue filter during sunset to get the "white balance" right. Missing the point there...
Since the vast majority of LF photography today is in this category of non-critical personal work rather than commercial/scientific work, all this about color temperature, accuracy, CC filters, etc. is rather pointless. Somewhat more important is the processing, age of film, etc. if you want repeatability and a result as expected given experience. Otherwise it's all good and usable regardless with some caveats, especially once scanned and edited later, as all E-6 must be since printing it traditionally is dead for all but a few people worldwide.
Some Velvia, before it was called "50", very old and developed at home in a 3-bath kit:
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