Yes, like u said after enabled the shell in bios, F10 on boot and you have the openshell in the bios boot menu along with Opencore, click it and then u can find RU.efi in EFI folder with command line which is cumbersome depends on which folder you place the RU.efi in the EFI. You can include the RU.EFI in your EFI folder but this RU.efi is making your installation complicated when compare to implementation of the old CFGunlock.efi in Auxiliary menu along with ResetNVRAM, Recovery etc.
On other note, i tried your new EFI with Opencore 0.6.8 but there are few glitches which i decided to go back to your stable 0.6.7 version.
1. There is an error when booting, this message is showing in split second. After reading some forums this is caused by missing item(s) in config.plist that the new opencore.efi unable to find.
View attachment 516508
2. The menu sticks to text based non gui even after i changed the Pickervariant to Modern from Default. It works on previous EFI. According to my reading, one or more icon file .ics file(s) that Opencanopy couldn't find in resources/image folder so it will automatically stick to text based menu instead of GUI.
Worst part is, it couldnt boot to my windows, opencore reboots everytime i click to Windows.
View attachment 516509
3. The picker arrow pointer has become erratic sometime and only want to stick to the first menu, have to key in numkey "2" if i want to boot mac.
View attachment 516512
4. I've seen you already included the FakePCIID_Intel_HDMI_Audio.kext, but i didnt see HDMI audio in mac sound menu, but sound just works like previous version.
5. The booting and restart are full verbose mode now which looks scary-kernel-panic-ish, perhaps you can delete "-v" in boot-args to make the boot and restart look less intimidating.