Main concern is dorsal hump & function - are my goals realistic? (Photos)

You have that bump on the bridge. Also, though your nose is strong in its forward projection away from the face. If only the bump is taken down you'd probably think the nose is still too prominent in most views. So we would bring the new straight bridge and tip back closer to the face.
However, when you make those two changes -- lowering the bump and "de-projecting" the nose, it tends to make the nose *look* longer, as if the tip had dropped, so it's actually important to elevate the tip as well. Not so much to make it look upturned or ski-slopey, but just so you don't look at it afterwards and wonder why it now looks too long!
How *much* to elevate the tip, or deproject the nose, or make other changes? We figure that out with morphs, well before surgery. I'd love for you to see some excellent professionally-designed morphs of what could possibly be done with your nose. Morphs could also help you identify better just what's bothering you, and help you set a goal for the rhinoplasty that's accurate for your tastes. Profile and three-quarter views would be particularly important in morphing your nose. (Side note: in my opinion, morphs should really be done by the surgeon, or he should direct an assistant as she makes the morphs. Morphs should be made with a constant eye to what actually *can* be done in surgery, for that particular nose, and the surgeon has that information and judgment best.)

I'd love for you to see some excellent morphs of what could possibly be done with your nose. It might make you feel better about the possibilities and help you plan your ideal goal.
Remember that rhinoplasty is an exquisitely difficult operation to get right, and you should only have surgery if you are able to make yourself very confident in your surgeon's skills. The changes that your nose needs require advanced techniques, and skill that most plastic surgeons don't possess with expertise. For most noses, it's much better to not have surgery than to have inexpertly-performed surgery. Read my essay on how to stay out of trouble while selecting a rhinoplasty surgeon. And it also discusses how to take photos that are best for online evaluations.

Yes, your goal is achievable. A hump can be taken down while maintaining a strong, natural profile. It is important to tell your surgeon at the consultation about your goals. The tip should not be pointy or overly rotated using modern rhinoplasty techniques.