@karakarga
As you surely know, the BIOS file named 9FXAUD73.FDe, which has been designed by Gigabyte just for the v3.0 mainboard model, is an AMI UEFI and not an Award BIOS. So it is rather unlikely to get such BIOS modified or flashed by using an Award BIOS tool.
On the other hand it is not impossible to get your current non-UEFI Award BIOS bootable off an NVMe SSD by inserting a customized NVMe Option ROM into it. >Here< is the related thread.