This is a great question that we get in our practice a fair bit and that we have looked into. In fact, we in association with our colleagues reviewed the largest series of injectible rhinoplasties done by anyone to date.I don’t want to make this a long diatribe about the merits of injectible rhinoplasty and if the aesthetics make a lot of sense, except to say that you should recognize that most people getting rhinoplasty want their nose at least slightly smaller whereas injectible nose jobs are by definition an augmenting procedure where the nose is made larger.
In general, we found that about 25% of people required a touch up before 6 months when radiesse was used, either due to partial resorption or because they wanted further augmentation. Moreover, other more longer lasting injectibles such as sculptra, artefill, etc can and do stay longer in the nose but can cause inflammation, infection, or a host of other problems. In fact, if you go to our blog a few weeks back we show an example of a patient in whom we did surgery who had had injectible nose job done some 7-8 months previously. (previous blog) In him, you can still see the injectible material that had to be removed. He is now very happy with his nose and he did great but it made surgery more difficult than it otherwise needed to be.
The point to all of this is that non surgical nose jobs, in our opinion, can be great to fill in minor defects or irregularities, but they do not necessarily replace or help achieve the goals that most people who want a smaller nose want. In your particular case, if you are set on undergoing a non surgical procedure, consider using temporary fillers like restylane, juvederm, perlane, etc which are made of hyaluronic acid, that way if there is a problem with the aesthetic it can be reversed relatively easily.
I hope this helps answer your questions. Should you have any more specific concerns, please feel free to contact us.