modprobe nbd max_part=8
qemu-nbd --connect=/dev/nbd0 /mnt/primary_cache/domains/WORKING-VM/mac_hdd_ng.img
mkdir /mnt/nbd
mount /dev/nbd0p1 /mnt/nbd
vim /mnt/nbd/EFI/OC/config.plist # (make our edits)
cd /
umount /mnt/nbd
qemu-nbd --disconnect /dev/nbd0
rmmod nbd