Hi, Perhaps we can help each other a little.After years of searching, today I had a hint on my 2nd great aunt. Born Catherine Jane Ping, daughter of Ellen Man and Sam Ping.
She married James Sam (s) The William you mention is a 2nd cousin. He was a shearer, and was returning married 1928 on the Darling Downs he was a shearer.
The Chinese names are a real problem with searching. Hope to hear back from you Kris