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Grub on the Libreboot X200

I have a LibreBoot X200 than has LibreBoot instead of a BIOS, which means that it boots straight into Grub.
Here are my e-scripts on how I updated its flash memory to a newer version of libreboot:

# (find-es "grub" "libreboot-x200-cbfs")

I don't know how to make it boot pen drives by chainloading yet.
I am especially interested in booting custom pen drives built with Debian live-build.
I sent an e-mail to the help-grub mailing list asking for help on chainloading.
Links (to messy notes):

# (find-es "grub" "mail-about-chainloader")

My /boot/grub/libreboot_grub.cfg file in /dev/sda1 contains roughly this;
note that it has (non-functional) entries that use chainloading and a hack
to boot a pen drive made with live-build without chainloading.

# See: (find-es "grub" "libreboot_grub.cfg")
#      (find-es "grub" "bootinfoscript")

menuentry 'Boot /dev/sda6 (with home on /dev/sda7)' --hotkey='m' {
  set root=(ahci0,6)
  linux /vmlinuz root=/dev/sda6 rw
  initrd /initrd.img
  boot
}

# Adapted from the isolinux/live.cfg file in the pen drive.
# See: (find-es "grub" "non-chainloader-usb")
#      (find-grubnode "GNU/Linux" "append")
menuentry 'Boot a pen drive made with live-build without chainloading' --hotkey='b' {
  set root=(usb0,gpt1)
  linux  /live/vmlinuz boot=live components quiet splash
  initrd /live/initrd.img
  boot
}

# (find-grubnode "Chain-loading")
# (find-es "grub" "grub-install-sda6")
menuentry 'Chainload /dev/sda6 (broken)'  --hotkey='c' {
  insmod chain
  insmod ext2
  insmod ntfs
  set root=(ahci0,6)
  chainloader +1
  boot
}

# (find-es "live" "live-build-chrome")
# (find-es "grub" "chainloader-usb")
menuentry 'Chainload to usb (broken)'  --hotkey='u' {
  insmod chain
  insmod ext2
  insmod ntfs
  set root=(usb0)
  chainloader +1
  boot
}