So I created my own app to do the whole process. But as we saw a while back, the mechanism being used behind the scenes is actually reasonably straightforward: there are manifests published by Microsoft that point to images (ESD files - more on those here), and those images can be turned into ISOs with a few ADK-driven tweaks. But there are some limitations, like being architecture-dependent and only presenting a limited list of Windows editions.
Now there is a Windows 10 version and a Windows 11 version. Since the initial Windows 10 release, Microsoft has made available the Media Creation Tool (MCT). Note: See the bottom of the log for the change history and latest version.
