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You could accomplish this in a couple of ways. The simplest method would be to deploy your base image, update it, then recapture it as your base image.
Alternatively, you could use DISM to update the image. This only appears to work if its a WIM file however:
Well I have found a nice little utility that seems t be doing the job well.
There are lot of updates to apply to a Server 2012 R2 base image and this tool seems to do a pretty good job of it.
Thanks for your suggestion.
Glad to hear you found a solution.