Hi Chris
Being an Astroart user It's option A for me, and as far as creating a Pseudo Luminance I find the best way is in PS channel mixer where you can look at using the best signal from the Red and Green channels and discard the Blue which is generally very noisy an lacking in detail in a OSC.
The one other thing I will say is that after stacking I'll split channels and normalize backgrounds to the Green channel before moving on to PS.
This will balance your color bias and also overall color balance quite well which is a big plus when moving Into PS.
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