Update:
I went ahead and put 91 on Port 4. I could not get the 622 to recognize/find the 91 sat.
But once I put it on Port 1, so that I had 91, 110, 121, & 119 on DPP44, and then cycled the power, it found it, so that I had 91, 110, 121, and 119 on the Check Switch screen. It also replaced the Point Dish satellites:
From: 61.5, 105, 110,
118.7, 119, 121,
129, 145
- - To: 61.5,
82,
91, 105, 110, 119, 121, 148
I downloaded the program guide, and ended up with no Dish programming, just Bev programming, but only the free stuff, including the Free Concert Channel.
When I put things back, including 119 on Port 1, then the receiver found the Dish channels. But the sat list on Point Screen did not immediately correct itself.
I was sitting around and started thinking that if it did download programming, there would probably be a conflict with channel numbers, and did not know if it would try to download multiple tables that would confuse it; so I went ahead and tried this a little while ago.
However, I still think it might work; but I don't think it would be worth it because it could confuse family members or visitors.
But if you put the Dish 622 using 119, 110, 129, and do a check switch without anything else, then it would find those and work. If it ever rebooted, I believe it would stay with Dish and just add a unused sat on Port 4 to the Check Switch screen.
Then if you disconnected the DPP44 inputs for 119, 110 & 129, and used the Bev 9200 with 91 on Port4, I think it would find it and remember it. When ever it reboots, I think it would still keep the correct info. But since Port 1 passes through, the Bev 9200 may find the 119 and have problems.
So I think I would just build a house with at least two cables from the comm rack to each location that you may want to put a sat receiver, and probably 3 or 4 cables to the main viewing area that would have both receivers. Then run 3 cables from the Dish 1000 to your DPP44 in the comm rack to feed Dish receivers, and then run two cables from a Dish 500/DPP Twin to the comm rack to feed upto 2 Bev receivers or upto 4 Bev tuners, or another switch if needed in the future.