Is It Possible to Restore Nasal Bone?

For individuals who have had their nasal bones too narrowed creating an hourglass effect or just too narrowed at the dorsum, there are several options.
Dorsal onlay grafts can be used or the bones can also be outfractured in conjunction with some grafting in the middle and upper third of the nose with cartilage to widen the nose. Implants can also be used but they are less desirable, in my opinion, due to hardness and risk of mgiration, extrusion and asymmetry. I hope this information helps.

This is an unusual and difficult situation. If I understand you properly, It is my impression that your best long term solution may be to undergo "out fracture" of your existing nasal bones, if possible. Other than that, there are a whole host of options that we use for reconstructive rhinoplasty that relies on the use of autogenous graft materials.

I assume you had a rhinoplasty before and that is why you are posing the question.
In rhinoplasty we remove the hump and that is composed of mostly cartilage and a little bone, that will affect the width of the dorsum.
Then the nasal bones are fractured and moved to close the open roof resulting from removing the hump.
If the nasal bones were brought in too much that will narrow the width of the nasal bones, then you need to have a repeat fracture of the bones and place the in a wider base.