I think like most have posted, it would work as long as all things are in your favor. Grass is smooth and short, long enough runway (ours was 800ft and only used about 350 to get off) and keep the weight down as much as possible.
If you go to the BVM site and look under the T-33 they talk about flying the P-80 on the P-60 at top gun. The T-33 is listed to fly with 11 to 17 lbs of thrust so this should tell you it will work just be careful to not horse it off the grass.