I agree with M Ljin the path most likely to succeed is going to focus on perennial crops. I don't know anything about the adverse pressures Tasmania, but assuming the climate zone reference is anything like the USDA climate zones we use here in the USA you're in a good macroclimate to meet the challenge. I'd focus on the long term challenge, which won't be calorie production. In that climate with consistent effort I'd sail right by the calorie threshold in a few years just developing the land on autopilot. The real challenge will be dietary nutrient profile and a degenerative environmental impact if practices neglect a waste stream, introduce a parasite cycle, redistribute nutrients with a geographic bias, etc. That's where my attention would be during design activities. I'm interpreting no inputs to mean short term dependencies on outside resources. A land area of just ten acres is several orders of magnitude to small to avoid resource scarcities.
Ten people is also an abundance of labor for ten acres so I wouldn't shy away from practices that require intensive management, but I'd still avoid practices that make the local (site) ecology dependent on human labor. After a good year of observation I'd plan transit ways, cite structures and water works, then work up a plan for the long lived stuff. Without knowing the site any proposal I make is just blind guessing, but it would likely involve a lot of timber and nut trees, some kind of livestock integration, and an alley cropping system (or equivalent) to make use of annual plants and your abundant labor resource to compensate for whatever design deficiencies appear until they're resolved. I'd probably also give a lot of consideration to aquatic and riparian areas. You've the rainfall to support them and the labor to do the land forming. They're just so productive! A one acre pond full of panfish and surface plants (lemna, azola, watercress, etc) with a half acre island full of running bamboo, waterfowl, locust and almond, and various utility infrastructure could be a powerful local resource center.