You could first flash the latest bios for your laptop, then you could use intel fpt to dump your bios, then modify that dump (make a copy of the dump and modify the copy), then after finishing everything else, use intel fpt to flash it. Make sure to read everything here to understand which ME is yours
To flash the modded bios, use cmd, if it is named fptw.exe then type fptw -d biosname.bin to dump, and use fptw -f modbiosname.bin to flash. make sure to save the dumped bios somewhere off the board in case you bricked your board, so that you could restore it as is using bios flasher like ch341a. Im pretty sure msi didnt lock writefw.