Prepare:

Create the following folders on the root of the C drive:
C:\Mount
C:\Mount\Drivers
C:\Mount\BootWIM
Copy the drivers you wish to inject into the C:\Mount\Drivers folder
Copy your wim file from your WDS server into to the C:\Mount folder.
 Execute:

Open a CMD prompt as Administrator
Navigate to C:\Mount
Use the following DISM commands to mount the boot.wim:
DISM /Mount-Wim /WimFile:C:\inetpub\OSD\OSDEPLOY\boot_de-DE.wim /Index:1 /MountDir:C:\Mount\BootWIM
DISM /Mount-Wim /WimFile:C:\inetpub\OSD\OSDEPLOY\boot_en-GB.wim /Index:1 /MountDir:C:\Mount\BootWIM
DISM /Mount-Wim /WimFile:C:\inetpub\OSD\OSDEPLOY\boot_en-US.wim /Index:1 /MountDir:C:\Mount\BootWIM
DISM /Mount-Wim /WimFile:C:\inetpub\OSD\OSDEPLOY\boot_fr-FR.wim /Index:1 /MountDir:C:\Mount\BootWIM

Use the following DISM command to add the driver:
DISM /Image:C:\Mount\BootWIM /Add-Driver /Driver:C:\Mount\Drivers /recurse

Change the Keyboard Layout:
https://learn.microsoft.com/windows-hardware/manufacture/desktop/default-input-locales-for-windows-language-packs
en-US: United States - English (0409:00000409)
en-GB: United Kingdom keyboard (0809:00000809)
de-DE: German keyboard (0407:00000407)
fr-FR: French keyboard (040C:0000040C)
Dism /Image:C:\Mount\BootWIM /Set-InputLocale:040C:0000040C

Use the following DISM command to unmount the boot.wim:
DISM /Unmount-Wim /MountDir:C:\Mount\BootWIM /Commit

Copy boot.wim in USB.zip with 7-ZIP:
USB.zip\USB\PE\sources\