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The blue data should already be in the luminance along with everything else. Blending the blue data with luminance would likely just degrade the luminance.
The reason it can work well with Ha (or any narrowband) is that you get strong SNR areas where there is stuff but not much anywhere else. Blending Ha does by definition degrade the Lum data to an extent by reducing anything that the Ha doesn't add to, like stars.
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