If you want to run Windows 10 in S mode, you'll need to create an unattend.xml file that must be applied to an image, which you can then use to do a clean installation of Windows 10.

In this Windows 10 guide, we walk you through the steps to create an autounattend.xml answer file containing all the necessary settings to perform a basic unattended installation of the OS.

Here, check the Enabled option. Under the Options window, specify the path to the .xml file that contains the Start layout. For example, C:\Users\Test01\StartScreenMarketing.xml.

Windows 11 is available to download as an .ISO file. You might want a drink before you start, though.