In your situation, the NPC will not be accurate. If you want to know what factors will matter for a particular college/university, you need to speak directly with the financial aid office. Sorry. But that is the way it works for international students.
Run your own numbers. Decide what your family can afford. Tell your kid what that limit is. Repeat that information until your kid understands. Sometimes the best option for an international student is to study in their home country.