Whilst the money and influence the Company possessed could've got him a Royal Commission to do so, he would not be operating as a member of the EITC, which is what he introduces himself as. Especially to the levels that Beckett does (supplanting sitting Governors etc).
The first known usage of the phrase 'I don't give a rat's ass' (which the pirate meant) in pop culture was Leon Uris' 1953 book Battle Cry, and it supposedly originated as a saying by American troops in World War II. Gibbs are interviewing potential shipmates, the drunk French pirate states that he doesn't 'give an ass rats' whether he lives or dies.
