hmm, i would try to source one maybe, alternatively if you can write the nut off, maybe molegrips? or fab up something to fit into those holes? pain in the ass really lol
You will not find a locking wheel nut key the same as yours you need to get it off by any means nesasary ie hitting a socket over the base of the bolt and using an impact gun undo it, theres no point in hitting onto the small part as it will just snap off