As a temporary solution, the Owners Corporation could ask the EV owner to purchase at their own expense a plug-in electricity meter ($25 from bunnings) and sign an End-user agreement to manually re-imburse the Owners Corporation.
This can be done under s.171 in NSW strata schemes act and doesn’t require a by-law, as there is no change to common property.
An example of this type of agreement is attached.
Regards,
Brent Clark
Wattblock