Cut the poultry into cubes. Place in a bowl with soy sauce and Worcester sauce. Refrigerate for 2 hours.
Heat safflower oil in a wok over medium-high heat. Fry the marinated poultry until cooked through (74°C / 165°F internal temperature), about 8-10 minutes. Add the onion rings and bell pepper strips, stir-fry for 3-4 minutes.
Add the sliced mushrooms and soybeans, stir-fry for 3-4 minutes.
Meanwhile, cook the vermicelli pasta according to package instructions. Drain well.
Season the meat mixture with soy sauce and Sambal Oelek. Pour in the meat stock and simmer for 2 minutes. Add the drained noodles and toss to combine.