I can see where this might become an issue but is there a problem right now?
I think this would be something that you could discuss with all the owners to see what they think.
But the first person who isn’t able to get their machine into the laundry may be able to take the scheme to NCAT and get everyone’s machines cleared out unless they were prepared to allow them to be used communally.
Two possible solutions would be for the owners of the existing machines to allow them to be used communally and for the power usage to be billed back to individual units using coded electrical meters.
Or you could clear out the existing machines and have coin or code operated machines installed for communal use.
As I said, this is something for discussion – perhaps reminding owners that “first in, best dressed” is not a principle that stands up in strata law.