Signed up so I could add my 2 cents. I had a single Hopper installed this afternoon. I contacted Dish Exec team because of on-going issues with my 922. They were quite happy to offer me a Dish-it-up to a Hopper.
You could try it. Some have wanted a 2h/1j system and was asked to do 2h/2j. When they added all 4, they were able to remove 1 Joey. You could ask for 1h/1j then change your mind to 1 Hopper. Does not hurt to give it a try.