Make a bootable Windows USB Drive

Format the USB drive and make it bootable

Replace ? with the letter of your USB Drive below

diskpart
list disk
select disk ?
clean
create partition primary
select partition 1
active
format fs=ntfs quick label="Windows Setup"
exit

Make it boot Windows 11 Installer

Copy over Windows 11 files

Use 7-zip to extract the contents of the .iso to the USB drive

Update Bootcode on the USB Drive

Replace ? with the drive letter of your USB Drive

C:\> & bootsect.exe /nt60 ?:

Target volumes will be updated with BOOTMGR compatible bootcode.

?: (\\?\Volume{guid})

    Successfully updated NTFS filesystem bootcode.

Bootcode was successfully updated on all targeted volumes.

Optional: Show an icon for your USB drive

You can configure an icon to display for your USB Drive to show in Windows Explorer, which can help easily identifying the drive.

Find an .ico file you'd like to use, or create one yourself.

Rename the file e.g. autorun.ico

In the root of the USB drive, create a new text file called autorun.inf and add the contents:

[AutoRun.Amd64]
icon=autorun.ico

[AutoRun]
icon=autorun.ico