I took this N perm from Feliks, actually his PLL video on youtube.

Na-Perm: R U R' U (R U R' F' R U R' U' R' F R2 U' R') U2 R U' R'

You do the R U R' U, then you do the J perm and then just insert the pair with the U2 R U' R'.

Na-Perm: R U R' U (R U R' F' R U R' U' R' F R2 U' R') U2 R U' R'

You do the R U R' U, then you do the J perm and then just insert the pair with the U2 R U' R'.