Using WireShark to inject data (man-in-middle)

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I'm new to WS and wondering if I can capture network traffic, modify it, and then pass it on to the recipient. What I am trying to do is sync my phone with itunes over WiFi. My OS wont let me install the latest version of itunes and it is "needed" to sync with the newer phone (I cant believe there is much difference in the syncing between a 6 and a 6S). I want to try to capture the communication and trick itunes into thinking it is talking to a older phone.

I looked at Charles Proxy because I know I can do that sort of thing with HTTP traffic but think the WiFi sync uses mDNS

Is what I want to do possible with WS, or can anyone recommend a way to do it.