Can non-financial accounting graduates enter the top four?

Yes, major is not a limitation. The four most important things are your potential, not your major. After joining the Big Four, there will be training in accounting-related knowledge, so it doesn't matter what major you study. The most important thing to enter the semi-finals is to improve English and prepare for the AC mock interview.

I only know that KPMG and Ernst & Young have in Chengdu. Go to the company website and call the company to ask.