Yes the nsp files are fine if they are installed since Nintendo splits them for fat3295% of my games are NSPs and I only have 3 or 4 XCIs.
When NSPs were installed with Tinfoil, they were already splitted in <4Gb blocks, even if I have an exFAT SD card?
What about all files linked to SX OS and emuNand?
I am trying to evaluate the quickness and feasibility of your solution with my full 256Gb card...