You can try Ken Rename.
I first changed the settings to replace all illegal characters with underscores:
Next I selected the option to change the code page of the filenames from Unicode to Windows-1252. This replaced the Chinese characters with question marks, which, being wildcards and thus illegal filename characters in Windows, were in turn replaced by underscores:
In case this does not suffice and you really need it, there might be a way to replace the characters with random digits as well, but I didn't check.