As long as you know the ImageIndex, ImageName, or the EditionId of the Windows Image that you want to import, you can automate Import-OSMedia with the SkipGrid parameter

ImageIndex

Odds are you won't know the exact ImageIndex, so this will probably not get used that often, but its here!

ImageName

You have several options for ImageName that can be used, so make sure you use a valid option

EditionID

You have several options for EditionID that you can use as well, read this link for the details