Thats probably a No??
Any work done outside of nissans hand is not warranted and thats unfortunate.
I would looking at it color chip paint if its in small spots?
Anything that there's no way you can't notice it? I'd have it repainted.
I could be wrong but you may want to see if the dealers going to help.
For your second question, The dealer would get a quote of cost and only cover that cost if your bodyshop charges more?
you need to cover the rest but I would ask the dealer to make sure
Good Luck and Very sorry to hear Rynil? I hope I spelled it right