[underscore]

Let me see if i got it right.
You do have already a collection of digital magazines (i guess pdf) and comics (cbr/cbz) and you want to read them on a small 6 inches greyscale display.
And you'd like to decrease the quality of the files you already have for the sake of having all on the device.
Make no sense to me, are you sure a standard cheaper tablet or an expensive Nova-C isn't covering better your scenario?

The only comics i keep on my Nova 2 is something small, simple and originally black/white like Peanuts where i can see it with no compromise

Maybe you can try on your smartphone/tablet a sofware like "a comic viewer" that can handle reading files from a local nas/network share.