Multibootusb has some advantages over Ventoy, in example you can boot it manually with any grub2 active system on main disk without necessity of using BIOS boot menu – just put some additional configfile with detecting root by UUID of efi and grub on USB any recognizable by grub partitions anywhere on USB stick:
search --fs-uuid XXXXXXXX-XXXX-XXXX-XXXX-XXXXXXXXXXXX --set=RootGrubUuid
search --fs-uuid XXXX-XXXX --set=StickEFI
set root=(${RootGrubUuid})
echo "RootFS: ${root}"
echo "EFI Path: (${StickEFI})/efi/boot/bootx64.efi"
chainloader (${StickEFI})/efi/boot/bootx64.efi
boot
Ventoy is very poor project in point of view you must clear all disk to just install obsolete fat16 partition instead just try first to use unallocated space and install on existing UEFI. Installing any other stuff than EFI images on that partition is also very strange it could be done even on another separate partition (ext4 in example)
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