To clarify… I am looking to do this via the iPXE menu options and not turn the setup into a netboot-only server. I simply want to boot a linux live CD in EFI mode when the option is selected, run a script, and then stop. I’m not super-skilled in the dark arts of BIOS/UEFI and it’s possible i’m confused here. Is it the case that once iPXE is loaded I can chain load a system setup to boot legacy and don’t need to be trying to use grubx64.efi, as shown here: https://forums.fogproject.org/topic/11194/poc-using-fog-as-a-netboot-server ?
P.S. it’s not super-important to support secureboot/signed boot in this particular case, but I wouldnt mind if that happened to fall out.