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Pkay, I've not done it in pixelmath, but it's a piece of cake with the script NBRGBcombine. Just combine your RGB, open the script, point it at the RGB when it asks for an RGB image, then point it at your ha image where it asks for a nb image, and tell it which channel to add it to (red, I guess is the common one for ha addition)
Edit: but I will also be following here for pixelmath tips!
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