And as for paying for the incentives, just drop GST on new EV's, nobody would even notice this had been done because the number of new EVs being purchased isn't that great because of the very high prices and long delivery times.
I would have a 2017+ Leaf on a boat tomorrow if I could get it into the country without paying GST.
However given production is so constrained worldwide, dropping the price here would just give dealers headroom to move their prices up and improve margins. They don't have to compete on price yet.
Better to rebate GST on imports of 2nd hand EVs up to a certain value (say $40K).