How to remove Windows 7 editions using DISM and/or ImageX

I am currently creating my own custom version of Windows 7, and I noticed something that bothered me...

When using the following command:

Dism /Get-WimInfo /WimFile:%install.wim_directory%

I noticed it showed four indices (images, editions, versions):

Index 1. Windows 7 Home Basic

Index 2. Windows 7 Home Premium

Index 3. Windows 7 Professional

Index 4. Windows 7 Ultimate

I was wondering if there was a way to permanently delete those images and keep only the Windows 7 Ultimate index.

I realize there is a /Get-StagedEditions and a /Remove-StagedEdition command that can remove certain editions from a mounted image, however, the former /Get command results in there being "no editions able to be removed."

Is there a way using DISM, ImageX, RT7 Lite, or anything else, to achieve what I am trying to achieve?

That is, create a SOLELY Windows 7 Ultimate Image?

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