Preheat a 6-quart air fryer to 390°F for 3 minutes. Beat egg white with coating water; separately mix rice flour, cornstarch, and salt in a shallow dish.
Dip cutlets in egg white; press into a thin flour coating and shake off loose powder. Dab with oil to moisten dry patches.
Air fry 2 cutlets 5 minutes; turn and cook 5 to 7 minutes more until lightly crisp and at least 165°F. Repeat remaining cutlets.
Meanwhile, simmer gochujang, sugar, soy sauce, vinegar, glaze water, and ginger in a small saucepan 2 minutes until smooth and lightly thickened.
Thinly glaze cooked cutlets; air fry in batches 1 minute each. Add sesame seeds; rest 2 minutes and slice into strips.