I've just found this obituary on the Thursday Island Noticeboard facebook page. I had lived and worked on Thursday Island in 1977 but never heard of him. All I could find were some early immigration documents from 1965 when he arrived in Australia.
His processing through the Bonegilla Migrant Camp:
Who was Helmut Schramm? I posed this question on their facebook page and hope to receive some replies.
P.S. I have since had one reply which explains why I never met Helmut: he only arrived on T.I. in 1983, after which he settled on Horn Island and worked as a jack-of-all-trades, but mainly in fibre-glassing boats.