We did it in a slightly different way. I’m in Victoria but it might work in NSW too. In Victoria, the committee alone can make a decision to improve/alter common property (within limits).
We have 12 lots and an area of common property the committee thought to use for storage. Two years ago, at OC expense, the committee installed, in that common area, 12 equal sized lockers/cages. We put a number 1 to 12 on each. We told each owner they were allowed to use a locker/cage that had their lot number on it but that the area and the lockers themselves remained common property. We saw this as a fair an equal use of common property for each lot and that the OC would stay in control of it all.
So far it has worked.