I also looked into the Joseph Banks connection yesterday. Banks kept a journal, and in one entry he records that a dinner guest was given the name of Epicurus on account of his enormous appetite. So that's likely a dead end as well.
But here's something interesting; Bligh died probably from complications of stomach cancer. Epicurus likewise died painfully of kidney stones and dysentery. And one of the historic associations of Bloodstone is to "strengthen the stomach". Is it possible that in his later years Bligh found a measure of solace in a philosopher who saw pain for an evil?