If you don't want to use anti-freeze (yes, adding glycol reduces your coolant's thermal capacity - and may impact the way it works with your block, depending on the block) why not just use an anti-corrosion package only?
You're in NZ, so I can't recommend something that's available locally - but I can suggest you go to somewhere where there are car or bike racers - here in the US glycol is banned from motors on the track because it's so slippery, so there are additive packages just for racers. I would expect the same situation for NZ.
Here in the states there's Valvoline Racing Super Coolant (sometimes called Zerex Racing Super coolant as Valvoline bought Zerex some while back but they're only recently trying to make that brand name disappear)
I've looked at the Valvoline NZ web site - and it doesn't look like they bring this product in. So maybe ask the racers what they are using.
All that aside, why are you mixing alu and copper in a system when you don't have to? Yes, Alu is lighter (and so is very interesting to racer types), but if you aren't carrying this PC in a race, why care about radiator weight?
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