FL ID will do it. Just don't cross that thin line to piracy. Don't be too forceful. How about doing this in a not-maxed-out ship? One people don't consider combat-worthy. Or under gunning yourself might be a good thing as well as not having full stock of bot/bat. Then you seem more like a poor beggar and less like an agressor. I like such ideas! Fresh water into Discovery!
I definitely vote on the FL ID. Pirate ID is shot at by every base, planet and authority in any civilised system. Also police/navy players will treat you as threat and will try to kill you.