G'day mate. Darwin here.
You're going to need temperature control, period, if you want to make good beer. I used to make Coopers kits at room temperature, it worked, they were alright, but it's just too easy for everything to go pear shaped. I got a $100 secondhand chest freezer off Gumtree and paired it with a $30 temperature controller. Problem solved, never had an issue since. Easiest "free" option is to stick the fermenter in an air conditioned room for the first 3-4 days (when most of the off-flavours are produced), air con is normally around 24ºC or something, beer will ferment a few degrees higher than that, but it's a lot better than >30ºC.
You're going to need 99% your ingredients posted in from down south. Ozbrew is a disgrace. The only thing they're good for is buying the fancier Coopers cans and even then they charge a huge markup.
As far as saison yeast goes, that's a good idea. I'd rather use a saison yeast than a typical ale yeast at 30ºC but keep in mind saison yeasts have a very distinct flavour/aroma (spicy like pepper) which you might not like, or maybe you'll love it?