If you still need a tester I can help out hopefully. I've been experimenting with several efi booting processes lately and tinkering with my 3 different installs (5.4 via Kaly, 5.5 & 5.6 Retail via DFE's) but I've got a extra HD I can put in a USB case and try this as well. Looks nice, clean and simple and a great step forward to painless maintenance and updates.