boot Debain ISO from GRUB4DOS
The GRUB4DOS for a standard AMD ISO file is:
title Debian Live CD
find --set-root /debian-live-504-amd64-standard.iso
map /debian-live-504-amd64-standard.iso (hd32)
This would work with most linux iso files, by just changing the name of the file and changing the title to display the name you would like.
I just figured this out by trial and error.