That's your only option. Although it's unlikely anyone will ever use that term to find it, so it may not be worth the effort.
Why wouldn't they, if it's the name of the place? (Unless you are suggesting that a location so specific should probably be in macro, not micro)
@OP, it might also be worth putting Garden Island Naval Base, which would also have to be searched for in quotes, but that is so common that regular buyers will know how to do it. Maybe irregular/new buyers will guess as it has to be done so often on Google anyway nowadays.
In any case, for whatever reason, I find (I don't think it's common, but I've had it through several updates of Firefox) that even CV terms split when entered, as do CV DA's; e.g. if I search Iceberg and choose Iceberg (ice), they system splits them into Iceberg and ice. (so both words need to be in the search, not just a correct DA selection of Iceberg (ice).