You can ask the butcher to butterfly the flank steak for you.
Substitute brisket with a chuck roast.
Substitute sirloin with a chuck roast or brisket roast
No beef substitution.
Substitute picanha with ribeye roast or sirloin roast
Substitute sirloin roast with boneless short ribs or boneless brisket
Substitute prime rib with topside
Substitute fillet with sirloin or rump roast