It does not sound like you are an appropriate candidate for a nonsurical rhinoplasty, although without photos I can only generalize. Injections of fillers into the nose works great when people have contour depressions, some asymmetries, or want a little more dorsal or tip definition. I can't see how placement of a filler is going to create some kind of illusion that will make the nose look shorter. Although it might have some mild effect on raising a droopy tip if injected into the supratip area, I would advise extreme caution. Injecting filler is not going to pull an overprojecting tip backwards - think about it, it's impossible. Here is my suggestion: see a plastic surgeon who is comfortable and experienced with BOTH surgical and nonsurgical rhinoplasty, then you will have the best chance of getting a rational and unbiased opinion.