I have added a new section to the bottom of Tutorial 127 which describes how to add rEFInd to your E2B USB drive so that you can boot to other payload EFI files directly from your E2B USB drive besides Windows PE.
rEFInd will create a menu automatically by searching for .efi boot files, so it is really simple to add it to your UEFI-bootable drive - just copy over the folder and move a few files!
Note that a few UEFI systems will not MBR-boot if a \efi\boot\bootx64.efi file is present on the USB drive - they do not show any MBR boot option and will only UEFI boot. This means you cannot boot to the E2B grub4dos menu even if they support MBR\CSM mode booting! This is why E2B does not include any \EFI boot folder or rEFInd by default.
rEFInd will create a menu automatically by searching for .efi boot files, so it is really simple to add it to your UEFI-bootable drive - just copy over the folder and move a few files!
For E2B users - see here for the download.
Note that a few UEFI systems will not MBR-boot if a \efi\boot\bootx64.efi file is present on the USB drive - they do not show any MBR boot option and will only UEFI boot. This means you cannot boot to the E2B grub4dos menu even if they support MBR\CSM mode booting! This is why E2B does not include any \EFI boot folder or rEFInd by default.