As it stands now, you should NOT install the Extended Ku LNBF if you are outside the footprint of G1. That's because Vancouver HD signals will be placed on G1.
During a Pacific time zone simsub, you will not be able to receive any HD signal as the the Extended Ku channel maps for a Seattle station will point to the Vancouver signal which you cannot receive. You will be stuck with standard definition only.
There is also speculation that when G1 is operational, Spokane SD channels will be taken off F1R. This is because all US cable heads that receive Spokane feeds from Shaw are within the footprint of G1 and therefore will be able to use the HD Spokane feeds on G1.