There is loads on "Dr Gosse" in SA papers, but I don't think any of it is 'my' Dr WF Goss. The waters are muddied by a prominent Dr William Gosse (at one time acting colonial surgeon) whose dates don't match up for my Dr.
Still looking!
Beck

http://www.southaustralianhistory.com.au/gosse.htm
Dr William Gosse (1812-1883) m Agnes Grant (1811-1891).
In 1850 the Gosse family with their six children, left England for South Australia, on the barque Elizabeth where they arrived in December.

Once there the family found accommodation in Hindley Street where the doctor set up practice. He was later elected to the Board of the Adelaide Hospital and campaigned hard for the immunisation of young children. In 1855 he was Medical Officer responsible for the Adelaide Servants Depot. (note from me, also prominent in work on Adelaide Lunatic Asylum)

Son Charles became a Dr also.

Son William Christie Gosse: In 1859 joined the Government Survey Office. William and his brother Harry both worked on the construction of the Overland Telegraph Line. William discovered and named Ayers Rock.
William also named Agnes River, Harry's Reservoir and Mount Hay in the MacDonnell Ranges. In 1875 William Gosse became Deputy Surveyor General.