I have the same question as John above. I've always collected HaLRGB with the RGB at 2x2 binning to take advantage of that fundamental perception trick that the eye gets it's resolution information almost entirely from the L, not the color. Vicent's method, on other hand, seems directed at HaRGB only where all subs, including RGB, are collected at 1x1 binning. That obviously works very well and I'm tempted to change my Ha collection habits but it seems to me that is a more inefficient method of collecting the data by basically getting the luminosity from the 1x1 binned RGB.
The only thing I still do outsided of PI (except print and make jpgs) is HaLRGB combination. For that I use Tony Hallas' HaLRGB combination method which is really (HaL)(HaR)GB. It uses the Ha both as luminosity (primarily for pulling out the faint structure not seen in Lum) and strengthening the red channel. Unfortunately the technique uses layers and requires PS but has the virtue that you do your best LRGB image and then put the layers together with the Ha in a final mesh that is greatly adjustable until you get it the way you like. So I also wonder if anyone is working on a script or tutorial, or just can offer advice, for doing HaLRGB combination in something like this style within PixInsight?