mine is not stripped but in so tight that i have never (i've owned the bike for 8 years) been able to remove it. i drain my oil thru the oil filter outlet and then the mesh screen filter on the side. i have a rear wheel stand and once it quits leaking from these 2 orifices i tilt the bike while on the stand to the right side and the rest pours out. not the smoothest operation but since i only ride a few thousand a year it has not been a big deal.
another option would be to warm the bike up good and try the methods mentioned by the others above. maybe the heat will help things expand and you'll get lucky. and spin it out.
good luck!