I don’t think you have much choice in the matter. The owners corp has an absolute legal responsibility to repair and maintain common property, regardless of the cost. What you should do is get competitive quotes for getting this all done in one hit then go and talk to someone like our sponsors, Lannocks, about getting a strata loan.
I know there are other ways of financing it but this is by far the least stressful, especially for people on fixed incomes.
The one thing you can’t do is nothing. Grasp the nettle and think about how much this is going to increase the values of your properties. By the way, if you were in Victoria, the people who benefitted most would pay more too.