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I was aware that narrowband clip in filters were available for DSLR.
Where this is leading to is the idea that I could use a filter like the 1000 oaks LP4 filter (transmission graph linked to in my original post) which has a relatively narrow bandpass for both Hbeta and Halpha to capture H data across each of the RGB channels of my DSLR at the same time, rather than just collecting Ha on the red channel only. Then use pixel math to combine the data from each channel using the LP4 filter to give a combined mono H channel, and then assuming a fixed ratio for Hbeta:Halpha (as per Rick's post) I could then subsequently blend back into the LRGB channels of a conventional OSC image from the DSLR. Thus achieving a HLRBG image with "H" collected using the entire bayer matrix rather than just 1 in 4 pixels.
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