My 2 cents... The approach begins at IAF. After IAF you should follow the arc and so on. There is NOTHING on this chart that authorizes you to maneuvre in any other way than to proceed direct to IAF via a right turn to the west to intercept the arc. There is no racetrack procedure published. In this case of course a base turn is a maneuver to do this, but in my opinion you should request it from the ATC since there is no such maneuver published in the approach procedure.