You can force EFI mode with a package install by editing the postflight script in the package:

  1.  Create a package from a Winclone image as you normally would.
  2. Control-click on the package and select Show Package Contents
  3. In Contents->Resources, open postflight with a text editor.
  4. Change the following line :

./winclone –self-extract -p ${restore_device} 2>&1 >>/tmp/winclone_package.log

to add in the force EFI flag:

./winclone -e –self-extract -p ${restore_device} 2>&1 >>/tmp/winclone_package.log