Can nasal deprojection be achieved without changing anything else about the nose?

Hello! Thank you for your question. As far as I can understand from your question, it is totally achievable. You just need to clarify it to your doctor that you just need nasal deprojection. Best Regards!

Yes this can be achieved with surgical preservation rhinoplasty. The main change will be noticed from the side view where the nose is de-projected (overall size is smaller), with minimal effect on the front view.

As the tip of the nose comes back closer to the face with the deprojection, the bridge must come back closer to the face, too, or else the bridge would really stand out. If you want the proportions to stay the same, the bridge would be reduced the same amount that the tip was de-projected. That make sense?
The woman in the link that I posted with this answer had her nose deprojected substantially. She also had a bump removed, but as I mentioned, that's optional.
How *much* to 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.)
Finally, 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. Making a good deprojection to the nose requires 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.