hi i'm zisqo, who's naughty at InsanelyMac discord channel.
writing Korean manuals for the opencore bootloader and spreading the guide to Korea.
btw this application will be easy to disable SIP, but just once at one time. (enabled SIP if reboot)
1. run Disable SIP application
2. allow terminal control
3. enter your system password
4. now you can add / delete / modify files at S/L/E and L/E on Read Only APFS Partition
have good luck.