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I don’t know what might be available down in NZ, but here we have this readily available aluminum brazing rod that requires no flux and is composed mostly of zinc. It is commonly called ” beer can rod” because it is often demonstrated at shows being used to braze two beer cans together. It’s melting temp is considerably below that of alum, my guess , about 700 *F. I have used it for several repairs, applied to a properly prepared joint it makes a very strong repair. The down side… it’s zinc not aluminum, the color is much darker that AL after it ages, also it’s much harder than Al, so finishing it off on a flush surface can be a challenge. Proper application requires through cleaning of the parent metal to ensure the first wet “tinning” application is complete. Once you learn how to use its pretty amazing stuff. Oh, propane or MAPP torch for must small repairs, the parts to be repaired have to be brought up to melting temp of the rod, the rod must be scrubbed onto the parent metal to ensure complete “tinning” of the surface,,, you can’t just lay it on.
Joe B