What is the best way to go about creating a sane - meaning adware turned off as much as possible defaults for Windows 10?

What I mean is preparing a custom ISO for installation.

I realize that technically it should be possible: https://learn.microsoft.com/en-us/windows-hardware/manufactu...

I have to handle relatives Windows machines quite often and have to reinstall Windows quite often.

I like how Rufus adds a default local user to standard Windows ISO. So something like this with more customization would be fantastic.