I wonder as im unsure in this instance if the blue badge bay would then just be discretionary thus allowing it to be used by one and all ( Scotland may dffer as their laws are more favourable)
It sounds as if the OP is in a private area operated by the landlord therefore the parking area is private (residents only). The only way a disabled parking bay may not work, is if more than one resident is disabled in that block. In this case ff the landlord put 2 or more disabled bays in and didn’t allocate them but, certainly worth a try going this route if only to get a charger fitted. The residents seem to respect where each person parks their cars so there’s no issue there.
The only otherway is if the landlord were to do a memorendum of understanding for the sake of having a charger fitted and withdraw it say in 12 months seen only in the small print of the leese agreement.