No, there’s no way in-game whatsoever to gain Concord Faction Standing. That means both direct and derived standing’s.
Concord Assembly has negative standing with all Pirate Factions and neutral standing with all Empire Factions.
And Thukker Tribe is not a Pirate Faction despite having negative standings with most of the other Factions. Thukker Tribe has positive standing with Jove Empire and Minmatar Republic and neutral standing with Angel Cartel, Concord Assembly, Serpentis and The Syndicate.
As for destroying Pirate NPC’s such as Sansha, that will only raise your personal Security Status…
And also lower your standings with Sansha and their allied Pirate Factions, Guristas and Blood Raiders.