Ultimate Boot CD

I'd like to add a couple of WinPE based ISOs to my UBCD, however I'm unsure what to put in custom.cfg as only using memdisk doesn't seem to work. Both ISOs use WinPE version 10.0.17763 (1809).

This is my current configuration:

LABEL -
MENU LABEL EaseUS Todo Backup
TEXT HELP
WinPE for EaseUS Todo Backup
ENDTEXT
COM32 linux.c32 memdisk
INITRD /ubcd/custom/ETB.iso
APPEND iso raw

LABEL -
MENU LABEL EaseUS Partition Manager
TEXT HELP
WinPE for EaseUS Partition Manager
ENDTEXT
COM32 linux.c32 memdisk
INITRD /ubcd/custom/EPM.iso
APPEND iso raw

I've been using Yumi for this over the last few years. ---> https://www.pendrivelinux.com/yumi-mult ... b-creator/

Often the ISO is extracted to the root of the drive so the boot loader works.