I like the grub.efi CD.
grub.efi wins.
We have this - (not exactly as above )
/Volumes/hfsp/boot.efi
/Volumes/hfsp/efi/test/grub523.efi
im81:~ pxw$ bless --info /Volumes/hfsp
finderinfo[0]: 2 => Blessed System Folder is /Volumes/hfsp/
finderinfo[1]: 8256 => Blessed System File is /Volumes/hfsp/efi/test/grub523.efi
finderinfo[2]: 0 => Open-folder linked list empty
finderinfo[3]: 0 => No OS 9 + X blessed 9 folder
finderinfo[4]: 0 => Unused field unset
finderinfo[5]: 2 => OS X blessed folder is /Volumes/hfsp/
64-bit VSDB volume id: 0x0F87F7680B9C5211
Apple Option restart shows the EFI boot icon, this boots grub523.efi,