Use of Medpor in Rhinoplasty for a Flat Nose?

I have a flat nose . I consulted a famous Rhinoplasty doc in New York and he has suggested that I need to have a medpor implant to give my nose the support . It would take 2 years to settle down. Cost would be around 20K for it. My question is 1. Is medpor safe on a long term basis? I am in late 40s 2. Is the cost justified? Does Medpor implants cost that high? 3. Would'nt the ear cartilage work to give definition in a flat nose case? 4. How about use of silicone? 5, Is 2 yr wait standard?