I know I just drained mine from properly full (changing seals while out of the car) and it was about 3/4 gallon which would be around the 6 pints claimed by Bentley. Pouring oil into the shifter hole will just result in 3/4 gallon of oil on the ground under the car because the shifter hole is just a hole in the end of a lever that goes into the tranmission about 12 inches forward from that point.
Filling thru the dipstick hole isn't that hard - you DO want to make sure the area around the hole is clean 1st so you don't introduce grit into the gears.