Thaw spring roll wrappers in refrigerator overnight. Keep covered with damp cloth while working.
Mix filling ingredients in large bowl. Combine minced pork, shrimp, carrot, bean sprouts, chives, mushrooms, scallions, vermicelli, eggs, oyster sauce, sesame oil, salt, sugar, and pepper. Mix well with hands until evenly distributed.
Assemble spring rolls by placing wrapper as diamond. Add 3 tbsp filling near bottom corner. Fold corner over filling, roll halfway, fold in sides, continue rolling. Brush top triangle with egg yolk and seal.
For deep frying, heat oil to 350°F. Fry rolls in batches of 4-6 for 3-4 minutes, turning occasionally, until golden brown. Drain on paper towels.
For air frying, preheat to 390°F. Brush rolls with oil. Cook 8-10 minutes, flip, cook 5 more minutes until golden.
Serve warm with optional dipping sauce made from rice vinegar, soy sauce, garlic, and chili.