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It’s wild that’s legal there! Where I live learners and provisional riders are restricted by power to weight ratio (150kw per tonne/200hp per 2000lbs), and that honestly seems like it keeps them on reasonable bikes for the skill level without having them all stuck on 125cc bikes struggling to reach the speed limit
You could try and make a DIY swamp cooler? There’s lots of instructions online for how to make them, and basically the only consumable is water. The only caveat is that they work by drawing hot air in from an open window to evaporate water, so it’s not very effective in high humidity or low temperatures.