Cook noodles in a large pot of boiling water until al dente according to package directions. Reserve 1 cup pasta water before draining.
While noodles cook, marinate ground pork with 2 tbsp soy sauce and Shaoxing wine for 5 minutes.
Heat a wok or large skillet over medium-high heat. Add marinated pork and cook, breaking it apart, until crispy and golden brown, about 6-8 minutes.
In a large mixing bowl, whisk together chili oil, sesame paste, 2 tbsp soy sauce, ground Sichuan peppercorns, five spice powder, sugar, and minced garlic until smooth.
Add hot cooked noodles to the sauce bowl and toss thoroughly. If sauce seems too thick, add reserved noodle water 2 tbsp at a time until desired consistency is reached.
Blanch chopped bok choy in the same noodle water for 1 minute, then drain.
Divide noodles among serving bowls and top with crispy pork, blanched bok choy, chopped scallions, and crushed peanuts.