I have actually done something very similar last night, whacking a HA filter in front of my ASI2600. I can probably afford to be less subtle with laying in the HA, but this is the first time I have tried it. The big challenge was getting the imaging software to focus it with the oddball looking results of having an NB filter in front of a bayer matrix, and working out what "Mean" value to use to shoot flats when all pixels are included in the mean calculation but the green and blue have very little data. I got it all to behave around midnight and went to bed to see what I would wake up to.
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