You can use the precooked, frozen shrimp in place of the uncooked shrimp.
We cook the pork chops ahead of time and keep them in the fridge as part of our meal prep. If you don't have already cooked pork chops, those will take about 10-15 minutes to cook, then cube, prior to starting the fried rice.
If you don't have ponzu sauce, you can use soy sauce as an alternative.
We use a rice cooker for our rice, which takes about 20 minutes to cook the rice in.