Ok lets say we can actually do that, lets see where this link takes us:List hardware specs of your pc.
If you're trying to install windows 7 on a modern pc, then USB drivers need to be integrated into installation.
If installing onto nvme drive, then also nvme drivers and several hotfixes need to be integrated.
You can integrate those drivers with gigabyte windows install tool.
Utility | Service / Support - GIGABYTE Global
Since I have a gigabyte motherboard, but won't this make the bootable usb incompatible for other pc's if it where to be used there.