Don't try to do it by being overpowering. Be subtle (pronounces "b" in subtle). If the band doesn't want to go whole hog on it, just wear something pirate-y to gigs, and answer questions from fans when they get around to asking. Get a pirate fish tattoo. Slip something into a song. There's no great rush.
"Mit der Dummheit kämpfen Götter selbst vergebens."
("Against stupidity, the gods themselves contend in vain.")
-- Friedrich Schiller (1759–1805)
Reality is that which, when you stop believing in it, doesn't go away.
-- Philip K Dick
OK, now let's look at four dimensions on the blackboard.
-- Dr. Joy
English isn't much of a language for swearing. When I studied Ancient Greek I was delighted to discover a single word - Rhaphanidosthai - which translates roughly as "Be thou thrust up the fundament with a radish for adultery."