One of the local conservation groups opposed to the channel deepening project made exactly that point and apparently sent a letter to the Queen asking her the same question. Unfortunately I do not know the outcome of the request. Somehow dredging rocky bottoms does not befit the name. Cheers, Jeff.
Next month the Queen is replaced by the Prince, as in real life, so the "PRINS DER NEDERLANDEN" will take over when the Queen is off to Singapore for lengthening with 51 metres and she won't be back in Melbourne.