Correct, it is not listed as supported and isn't supported.

How about using rsync instead?
Create a VM with the same kind, at least same size hard drive, same type of OS and same kernel on the destination, then create an exclusion list for files and directories you don't want or need copied over (/boot, /dev, /proc etc) and then run the rsync command with the –delete option.
When the Linux distributions are the same most (over 90%) of the files don't get transferred. If the /boot partition is excluded it's important that the two kernels are identical otherwise it will cause problems. If the /boot partition is rsync'd then the initrd file will be wrong and will have to be fixed. You may still want to keep the install discs ready, and man rsync for more options.