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I have in the past tried integrate vastly different subs and it has always ended up in complete chaos. The difference in the Ha and luminance will help the stars but you WILL get some very bad specklding in the nebula regions.
What you might be better off doing is making a star mask on the Ha data and using PixelMath to incorporate the luminance stars. Off hand, you may need to blur/soften the star mask so as to preserve the light falloff in the luminance data.
Conversely, you could make a star mask in the luminance and drop the Ha data (nebula) into that.
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