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Rob,
I don't like the PI scripts much since I can't tell what they're doing without reading the source code (or the French documentation), and I'm too lazy for that.
I've found I get the best results from using LinearFit to make the data compatible (e.g. fit Ha to Luminance) and PixelMath for combining Ha and Lum or adding Ha to Red and Blue. The usual problem of adding Ha to Lum resulting in pink/salmon colours is not a big issue if you fit the combined Lum to the original (don't forget to use RGBWorkingSpace to set a 1:1:1 space for luminance extraction) and play with the saturation curve or CIELAB *a and *b if needed.
Cheers,
Rick.
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