I chose ring for the simple reason that I do not use it while I am drawing, and I barely use it when I am typing and I could likely easily get used to using my pinky or middle finger for the keys I would need, if I had no choice.
Since I don't really do much else with my ring finger other than occasionally faking people out to think that I'm flipping them off (which I haven't done since I was 15 anyways), I think I would be OK with getting rid of them, if I HAD to choose.
although, I AM a bit curious about what this has to do with Astronomy...