No, I never got around to it. It's probably worth a try but my, admittedly limited, experience with nitrogen, sulphur and oxygen narrowband imagery makes me suspect that to get a meaningful signal out of any variations in the ratios of Hα to Hβ would require a lot
of exposure time.
I haven't done any astro-imaging since that NGC7822
shot. I keep meaning to but my conservatory, where I keep the astro kit, has been acting as storage space for stuff usually kept in my garage during building of an extension to said garage which has rather limited use of the conservatory since the autumn! And then there's been the weather...
I think my next project will be to return to the subs I took way back of the Andromeda galaxy. I've never published a version of that image using my "full-fat" colour workflow for the simple reason that I don't like the result. The actual colour of the core Population II region is really very orange, if I remember my preliminary looks from almost a year ago correctly, and quite frankly the aesthetics suffer as a result. But I think I should bite the bullet and recognise that the universe is the way it is and not necessarily the way I'd like it to be. A useful metaphor for life.