I agree with KP on this, especially as it sounds as if one owner is going to be left out of the equation, leaving the EC wide open to a ‘fraud on the minority’ case.
A much, much better plan is to install lockable storage cages and rent them to owners on a first-come, first served basis. The money raised will pay for the caging and thereafter becomes a income for the strata plan.
The Owners Corp retains control over the area, just in case it is ever required for something else.
Right now, you can ask anyone to clear their personal goods out of common property. It’s not a matter of taking sides, just of establishing control over the commonly owned space (probably on the basis that there is no written permission to store goods there).
When it’s empty, lock it up and start again. But this whole exclusive use strategy is so fraught with potential problems I would delay registering the by-law until the two years are up, just so you can start again with something that is much fairer and more equitable.