Is it really necessary for the mobility scooter to be in an enclosed space? If so, could the scooter be accommodated in the enclosed garage space? I assume the resident’s car could be accommodated in the carport space. That would be a simple solution requiring no change to the building’s appearance and no expense to the unit owner. If I were another owner, I would prefer that solution. A unit owner might prefer to keep both their vehicles in enclosed spaces rather than both under cover but only one enclosed, but that is not a compelling reason for other owners to accommodate that preference.
If it really is necessary to enclose the space, does it have to be a highly visible or permanent change? Where I live, some open sided carports have used concrete reinforcing mesh fixed to the open side to provide security while retaining the open appearance from further away. This is inexpensive and reversible. A condition of permission to do this could be that the appearance of the carport is restored to original when the current owner is no longer the owner or no longer needs to have the space enclosed.