I'm of the belief that you let Kupp get his 10 catches this week, and focus on getting to Stafford and not giving up the big play.
You could have Diggs shadow Kupp, but then you'll have Diggs working out of the slot frequently. Might be better off the let Diggs play 1v1 on Robinson which he could in theory pretty much eliminate altogether. Then you really only have to worry about Kupp as a true threat. Higbee isnt a bad receiving TE, but the Cowboys have been very good keeping TEs in check so far this year. Partially due to how they have used LVE, but also heavily due to the fact that teams need the extra blocker against this pass rush.