Do you have like a tutorial for that ?I've been doing this since SwSh came out. Edit it, back it up, launch SysCFW, and restore it. You're in virtually no danger. My saves are edited to the point where nothing seems real and I have no issues. Just make sure your Pokemon are legal if you plan to use them in ranked online battles.
have you done this with Scarlet Violet yet? I just need the save.Load JKSV on emuMMC
Back up save
Reboot
inject hekate payload
load sysCFW
open homebrew
restore save with JKSV