You can still switch to Audit mode during install using SHIFT-F2, follow https://bartsimons.me/sysprep-generalize-windows-image-witho... to disable OOBE, then replace e.g. Narrator.exe with cmd.exe and set an administrator password. After that you can revert Narrator.exe back. It's a bit complicated, but it works and you don't have to create any additional accounts if you don't want to.