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What camera are you using Peter? Is it a dslr?
I’m afraid I can’t help you too much with a PI solution I have done it a few times with a dslr and Ha (and OIII) but in DSS and Photoshop and it was capable of obtaining parts not visible otherwise (eg O3 shock wave around NGC 6164).
If it is a dslr you can always set it to black and white mode when capturing Ha – sometimes extracting the red channel after debayering can result in an image ¼ the size of your regular RGB (only red pixels) – again depending on settings.
There are different ways to layer in Ha into an image. As in using it as Luminance but this won’t really work for a galaxy - as you have suggested.
with Ha and R channel blending. But sounds like you’ll have a bit of experimenting to do! Looking forward to seeing how you go.
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