The Avro Vulcan bomber is a very close layout & flying requirements to the Concorde. British modeler forums can give you a airfoil that will work. My 60" Vulcan has a very close relative to a Clark Y.

When in doubt MAKE the outer most ribs have a MUCH lower stall speed. By using a different airfoil or tipping the trailing edes up. Either will do. Nobody cares. Except you when a tailwind gust in a turn causes the main wing sections to lose lift. Kneeling down next to our planes pieces, chokes me up badly.

Rich