Fat Injections on the Nose?

The subcutaneous layer of fat that envelopes the nasal cartilages is thin and uniformly distributed. Fat transfer can be theoretically performed on the nose but is not technically easy or clinically reliable as a method to improve skeletonization of the nose.

Most plastic surgeons would be very reluctant to inject fat into the nose as a definitve treatment due to the difficulty in predicting take as well as the relative thin layer of tissue covering the nose.
The use of fillers ("non-surgical rhinoplasty") may be a way of assesing the value of performing fat injections but this would remain a relatively unpopular method of treating nasal irregularities.

I believe that in secondary Rhinoplasty, basicaly when dorsal augmentation is necessary due to over resection (the most common deformity after primary) Fat grafting is an amazing tool. I desagree that is technically difficult. It is very easy to do, and help to make thicker the dorsal envelope. Fat grafting to the nose should be always an option.

The thin skin and fine features of the nose makes this procedure a lesser choice than other fillers for correction of nasal contours. 

I suggest Radiesse or Juvederm to correct these types of problems.

All the best.

While it is probably safe to fat inject the nose, it would probably be technically very difficult because of the very thin subcutaneous plane in which the fat would be injected.

Fat can be injected in the nose. Because the nose is at the center of your face the margin of error is very small. You should definitely consider going to someone who has a lot of experience doing this type of procedure.
Fat injections have an immense variability in terms of the results that you can get from it. There are many steps that go into fat injections that can insure that you have reliable fat survival. This reliability is essential to knowing whether the fat will survive in the areas that you implant it. If some survive and some fat cells don't, the possibility of having variable results is possible. But there are always remedies. It is better to be on the conservative side so that you don't inject too much. It is always easier to put more fat in than to take too much fat out.
One thing that is important to realize is that injections around the nose can be more dangerous than other areas. There are larger veins in this area, and also, the veins here don't have valves and can serve to allow fat to travel backwards into deeper structures. This can lead to significant complications. You have to be aware of the literature to know how to prevent these things from happening but there is always the chance of things happening with anything that you do.