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Spraying a white primer from above on a black primed base is actually a known and suggested technique (zenithal priming), though from what you're saying you're wanting to do a full re-prime. I haven't done either, but I suspect as long as you're using a few light coats it should work pretty much the same as just starting white if you get complete coverage, to actually popping a bit better if you go with the zenithal.
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