Hi @Anonymous User
Yep no problem using the NowTV Stick with your passes (assuming that none of your passes are the Mobile Sports Pass where you need to view this type of pass with a smartphone only).
All other passes will run fine on a NowTV Stick if your television has a spare HDMI port on it.
When you buy the Stick, just setup the Stick using your existing account details.
Cheapest places at the moment that i can find for the Stick is Asda online or B&M Stores.