1. GoPro's warranty does not cover wear and tear. they may warranty it to show good faith, the Hero 8 has a back order on warranty, they just got their replenishment in
2 you will void the warranty if you purchase a faceplate and do it on your own, Ebay 25.00 about.
A the lens will have to come out and adhesive back on to the new plate, and the seal will need to be broken on the face plate, and reglued. and wil lit be 100% waterproof??? You may have to buy a new lens glass with adhesive?
3 you may file it down, or best leave as is and continue on.
Is it worth it????
I had war wound to on the corner and even wore out my mode on button rubber ... warrantied it, liek said wear and tear not covered but gopro is replacing because of bug and issue ways around things.