Yeah.. Im pretty sure it would take a lot longer to try and "fish" the cables through there than it would to just take the two side fairings off. You might be able to get away with just removing the right side fairing and not removing the gas tank. I honestly cant remember since its been so long since I swapped to the Motion Pro throttle and I think I already had the bike torn down to the frame, anyway.
I actually ordered two, not expensive and thought I would get a spare.
One from AOMC but they take several days to ship even after they have in stock (I don't understand this and neither did their guy on the phone)
Other one i got from WheelSports, they also take their time shipping even after part shows (received).