Hey guys, so here's the first draft of my N4 method (yet another ZZ 4x4 method.) PM me is you'd like to help me look into this further. The main goal of this was to minimize the amount of EO pairing while solving as well as drastically reducing rotations (also opens gates to M slice pairing in the beginning if you like that

)
1-L/R/D centers: Fairly easy, would recommend L/R first then put in D
2-Pair DB/DF edges and place in DL/DR: solvable with D or D'
3- Pair 1 more D layer edge + a corresponding E slice piece and put both oriented in E slice: 2 edges that make a 3x3x1 block (Orange White and Orange Green, Red White and Red Blue, etc)
4- Solve Last 3 Centers
5- Place line edges and solve 3x3x1 block with prepared edges: Hide block in the back of the cube
6- Solve one more 3x3x1 block: Same criterion, hide in back of cube
7- EO pair last 6 edges: I'd recommend that if you find parity to ensure that the parity is on a U layer edge to make blockbuilding easier
8- ZZ F2L
9- LL: Reccomend COLL and EPLL+Parity
If you have any questions, please let me know and I'll answer to the best of my ability. Still a work in progress and definitely in development, but if anyone's interested I'd be happy to work with them to make improvements!