You tag him, and he appears. *smoke bomb*
A4N uses aluminium sulfate - a commonly available industrial chemical produced by its offtake counterparty Orica - because aluminium sulfate is already produced to relatively high purity (98%+ or food grade 99.4%+), has about 22% aluminium oxide content on a dry basis, is stable, shippable, able to be stored safely in large quantities and is available in large enough quantities. This is not confirmed because A4N refers to "industrial chemical feedstocks" and the like, but it's pretty obvious.
So, what's KRR going to use that is readily available, non-toxic, non-flammable, high enough purity to start with, water soluble, and able to be stored in an industrial setting without extreme regulatory gymnastics in a Western Australian setting?
It sure as Dickens isn't aluminium nitrate or aluminium bromate. It's not going to be aluminium chlorite hexahydrate (ACH) because you aren't mad enough to pretend you can access 20Kt of HCl per annum (and the marginal cost of $350/t HCl which would need to be sold vs returned to circuit, would render this precursor route a non-starter). It's likely aluminium sulfate. Which could be produced by adding literally anything clay-like and aluminous to sulphuric acid, and precipitating the liquor. Magic, bingo bango, you've taken $140 of industrial grade sulphuric acid, added it to something else, and produced a pure precursor of aluminium sulphate.
You then try to sell that as a HPA precursor to...A4N or similar...for a reasonable mark-up of 40% over your costs, and hey presto you have a "viable" HPA precursor factory business selling agricultural chemicals to HPA processors, without using a gram of Speewah **bro. Magic.
Problem is, you're competing with Orica, one of the largest vertically integrated chemical conglomerates in Australia. I'm not sure what TB's swinging heft is on his chutzpah, but to my mind, you'd have to outcompete Orica on purity, availability, and logistical access to compete with their ability to produce at a whim, guaranteed, in the volumes required.
Not sure that KRR has that.
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