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One word: Impossible. Period.
Human eyes are not sensitive to Halpha at low intensities. Otherwise one can see colors in Eta Carinae and even the North America nebula.
The 'red' you 'see' is just wat you want to see, but actually it is monochrome bluish green as only the rods in the eye are activated.
Using a larger scope does not increase surface brightness as a larger scope won't allow using low magnifications: one is stuck to 1/6x per mm of aperture.
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