I set up another windows user on my desktop named Marks ipad. The only things I have on it are access to the files, programs, etc, ie8, iTunes and the usual network and Avast type stuff. I use it only to sync my ipad under my own account and have the owner user set up for my wife's ipad on her account and my kids ipods . There might be other ways but it is the closest thing I could think of to getting a second computer just for iTunes sync.
Fwiw I hate iTunes but it is a necessary evil to get the most from our Ipads
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