We think the "Hahndorf midwife's China" is the same as the "Ebenezer Cemetery Miniature China" found in two cemeteries in the Barossa Valley in South Australia, an area settled by Wends and Sorbs from 1842 onwards; some came from Prussian Silesia. The most recent grave it is on is dated 1905.
Hahndorf, further south, was settled in 1839, also by religious refugees from Silesia; they were a tight-knit community for a long time, but communicated with other German-speaking settlements. The former midwife's garden has two old plants of the mini-China, possibly from the late 19th century.
The rose has similarities to "Oakington Ruby", but that one didn't reach Australia under that name until the mid-20th century.