Permacol for Nasal Implant?

That wouldn't be my top choice for a revision rhinoplasty (nose job / nose plastic surgery / nose cosmetic surgery / rino plasty / rhynoplasty). This product will get absorbed and might have a potential for an allergic reaction. The manufacturers state that the implant is eventually replaced with your collagen. I think that this needs to be further proven. My position on new products is that I let others make the mistakes with it first and then I'll use it if it has proven itself over 5-10 years time and has shown a strong safety record.
Because you have had previous implants with your own ear cartilage I would suggest that you might want to think about rib grafts. Cranial bone grafts are an option but they are considered by many to be too firm in the nose and have a variable absorption rate. A rib graft does have a significant commitment associated with it that you would need to accept. An alternative would be a silicone implant that is a better option with your first surgery but less so the more revisions you have. I wouldn't consider an implant after the first revision. The risks of infection goes up. But possibly for the second revision if you really didn't want a rib graft.
I hope that helps!

Permacol is a pig collagen and can get absorbed over time. This means after a certain time you might lose the improvement in the shape of your nose.
The most important thing for you to answer is if the shape of your nose bothers you and how much. If it is only minor deformity then you are better off not doing any surgery. The risk of revision surgery is high. If you still want to proceed then the best bet is your own tissues. If the nasal septum cartilage and ear cartilage is not available then rib cartilage can be used.
Regards