Make TNT sulfur cubes explode when they touch redstone block sulfur cubes

It would be so cool if a sulfur cube with TNT inside exploded as soon as it touched a sulfur cube with a redstone block inside. I have an idea for making bombs using Happy Ghasts: you attach TNT sulfur cubes to one and redstone sulfur cubes to the other using leads, then drop them one after the other, all while facing the constant danger of the two blocks touching and exploding while you travel to your destination.