Does your TV1 remove have a removable key? If so, you can change the key to use a TV2 remote key... and make sure the satellite address is programed to the same as your other TV2 remote... and off you go.
The TV1 remote that ships with the 622 is a #5.3 IR only, so if your plan is to use that remote elseware in the house you will not be able to. It seems crazy to me that they don't send 2 #6.3 IR/UHF remotes with the 622. What do they save $0.50?