Just because you could cook something in a PC doesn't men you should. Most of the work and time in doing a stir fry is in the preparation of the ingredients. Lots of chopping, slicing marinating. The cooking is very quick over high heat. I think a PC would actually take longer than a wok for a stir fry. By the time you got it up to pressure, cooked it and depressurized it, the meal cooked in the wok would be done.
"If you want to make an apple pie from scratch, you must first create the universe." -Carl Sagan