Rhinoplasty for a wide nose... but without removing the bump?

Any rhinoplasty surgeon should be focused on helping you achieve your personal goals while maintaining / improving function (breathing). The best way to determine what is possible is during a consultation with your plastic surgeon, but in principle that sounds doable.

To make an assessment, we need quality information.
This means at a minimum we need to see pictures.
Trying to describe in words what you’re hoping to achieve really isn’t very helpful.
If you’re motivated enough to have surgery, then schedule if you in person consultations with plastic surgeons in your community.
Changing the width of your nose is difficult and more complex than changing other aspects.
It can be done, but it comes with certain drawbacks like potentially visible scars around the nostrils.
I think you’ll be better off saving your questions for a proper consultation.
Best,
Mats Hagstrom MD