Why not get a second box?  Yes you will have to incur another $4.99 for the box.   I am sure if you are a long time customer and use the I am going to Dishnetwork they will give it to you free from what I read on here.  I had Dish Network and wouldn't suggest it.  The packages are nothing compared to Directv.  I can't speak on Customer Service on Directv side because mine will not be installed until 10/30.
I do know when I was with Dishnetwork they refused to allow me to have a two tuner DVR.  I called in to cancel and sight that the ridicolous policy on current subscribers not getting Two Tuner Dvrs.  Granted this was a few years back but I will not go back to them.