Are nano-fat injections safe to use on the nose?

After 2 failed rhinoplasty revisions, doctor is suggested nano-fat injections to help damaged skin & tissue. He thinks it'll help the soft triangle become healthier for potentially a third revision. Problems include, visible tip graft, pink & sometimes purple nasal tip, scars from perforations from the last surgery, clicking cartilage & frequent pain. It's been one year since the last surgery. Does this sound like a reasonable plan? is there risk of necrosis or blindness? time for a new doctor?