No need to replace the dp twin with a dp plus twin and a dp plus 44, the dp twin will work with a dp plus 44 switch and will be the easiest thing to do. The dpp44 will allow you to run one line from the switch to each reciever, at the 322 you will have to connect an included dp seperator at the end of the run from the switch and add to the seperator the included 6 inch jumpers to connect to sat ports one and two on the reciever. You will have to run a new coax from the tv2 port out to the remote tv that the reciever will run or you can purchase 6 diplexers and combine the tv2 output down the same line as the sat feed line to make it easier though if your not familiar with any of this then forget the diplexers unless your willing to spend some time on putting this altogether. The line thats going to the 811 should be the reciever one line on the switch as that line requires the power inserter to be atached and will most likely be the easiest one to set up. One more thing to do though, you will need to change the remote address on the 811 and the tuner 2 remote address on one of the 322's so that they dont interfere with each other.
How to change the remote address on a dish pro reciever.
Take your remote and press menue, then 6, 1, and 3, you should see the system information screen, at the bottom of this screen there will be a box with the number one in it, that is your default remote address.
Hold the sat button on the top of the remote down until all other function keys light up, release the sat button seeing that it is blinking, now press any number after 1 such as 2, then press the # button and watch for the sat button to blink 3 times, now press the record button on your remote and you should see the number change in the box on the screen to what ever number you chose, if it doesnt change press record again and it should then change, if not then repeat this procedure again.