i believe the trick with rolling it backwards is to provide enough slack on the tensioner side for it to jump another click.
having had it out for the third time this week it doesn't take that long when you know how.
- tank off
- battery out
- airbox side covers off
- release the bracket across the frame
- ht leads off the plugs then fold the lot back over towards the seat
- release the bracket holding the tank drain
- undo the two side nuts holding the air box
- release the clamps on the intake side of the carbs
- slide the air box back into battery space and then tighten the two side nuts to hold it in place.
- undo the clamps engine side of the carbs and then lift the carbs up
- secure them up in place