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I used to use an old Lumicon Ha filter (same as yours - deep red glass) a very long time ago... My camera at the time (QHY8) had a UV/IR block on it, so essentially, it was just an extreme LPF.
I'd do a set of images with the filter, even during 50~75% moon, extract the Red channel, then at new moon, shoot without the filter.
You can then blend the extracted red channel into the OSC image's red at ~25% to 40%, and add it as a luminance layer too.
Did a fantastic job for the $80 odd I payed for it. At the time, a $400 6nm Ha filter was absolutely out of the question for me...
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