Yes it's possible
Maybe you could give me an idea on how to make it work ?I have the same kind of problems, I tried to edit the texture of kukui, but nothing is showing up.
I even tried to switch his model with lusamine one, but same, nothing happen
I tried with OnionFS and LayeredFS redirections, but as I said, nothing happen.
If I try with a RomFS redirection using Luma3DS, I have a black screen + freeze when I press continue at the start screen, after load my save.