Just follow the procedure in post #1. That will give you a UEFI install.Next step I want to try install Windows 10 Pro UEFI to sperate nvme, if im not mistaken the guide is for a legacy install? I think i have some more researching to do, or is it a case of creating a USB installer, remove all other drives and install?
Great!I already have a backup reconstructed mac boot rom for regular 90 day servicing.