I’ve been searching for years. They exist (seen on YouTube, but can’t use), but nobody has indicated that they have it or can get it. I’ve tried myself with various international vendors, but with zero luck.
Still would love to get it
I found them! They are included in this!
https://www.blu-ray.com/movies/Marvel-Cinematic-Universe-Phase-Two-Collection-3D-Blu-ray/136435
How do you know that the extra footage is here? It mentions absolutely nothing about Chinese exclusive footage.