It will be great if your Chinese speaking students can help you out with this. Also, have you asked any of them to provide a more accurate translation into English of the two "Charlie Chn" movies that you have been investigating?
I can ask them over time for assistance. I don't want to impose on them too greatly to do a bunch of free translation for me, but I'll see what I can do. The automatic translations are tantalizing, but extremely garbled. However, when I see 'Detective Chen Chali' in the translation, that seems to indicate that Xiyuan Xu is playing Charlie Chan in the film at least.