I hope this worded correctly. I have a 1000.2 western arc dish with a 722 receiver (owned by dish) hooked up for 2 tv's, one in HD the SD. I also own 2 other boxes (722 & 222) that I can turn on and off when company or the grandchildren come over without having to return equipment to dish. My question is, can I replace the Dish owned 722 receiver with a Hopper & Joey so I can get HD to both tv's and still be able to use my personal 722 & 222 receivers when needed.