Fat for non-surgical rhinoplasty? Artefill is better, IMHO.
I'm not a huge fan of fat transfers in general, but the nose is a place I really don't like it.
As a temporary, try-it-before-you-buy-it solution, I tend to recommend Juvéderm (a long-lasting hyalurinic acid gel filler). If the patient likes that, then I usually suggest making it permanent with Artefill (a PMMA-based filler and the only FDA approved non-resorbable filler).
All the best,