Possible to shave down a bump on one side of nose without osteotomies?

It is hard from your description to tell exactly but sometime the bump can be improved just by "sanding", or rasping it down.

A small bump can be reduced with rasping instead of osteotomies. It is a smaller procedure than osteotomies and can be done under local anesthesia. RegardsDr. J

Hello and thank you for your question. It is possible to reduce a small dorsal hump without osteotomies in the right patient.  Make sure you specifically look at before and after
pictures of real patients who have had this surgery performed by your surgeon
and not just a computer animation system. The most important
aspect is to find a surgeon you are comfortable with. I recommend that you seek
consultation with a qualified board-certified plastic surgeon who can evaluate
you in person.
Best wishes and good luck.
Richard G. Reish, M.D.
Harvard-trained plastic surgeon

When shaving down the dorsal hump, it doesn't take much to create an open roof deformity, therefore  Osteotomyies are usually required in the nasal bones to straighten  and narrow them, and close the open roof created from the hump removal. A full set of photographs required to make a determination along with an in-person examination. The hourglass issue also be addressed with osteotomies in addition to spreader grafts placed underneath the concave upper lateral cartilages.

Most of the time, taking down a small bony nasal "bump" can be done with only a rasp, and osteotomies can be avoided.  Osteotomies are usually performed if the "bump removal" leaves the patient with a wide/flat dorsum.