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Peter,
It’s one hell of a challenge. A 4”-5” reaching galaxies at mag 19 - and in colour - tells me it’s not impossible and a factor of 2 in aperture should make a useful difference.
From the double stars I’ve tried the MK91 easily has the resolution to split it cleanly in 8/10 seeing near the meridian - if it was magnitude 11 or brighter.
But at mag 17 the time needed to image this is s serious problem. I suspect it’s feasible, if “success” is an indistinct blob distinguishable from a star, and it could be full spectrum monochrome - doesn’t have to be colour. In this respect a mono camera with no Bayer filter would be the go.
You’d have to be phenomenally lucky seeing wise, and guiding at sub second of arc rms the whole time.
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