Perform a moonfall with stored fall speed to clip into the air space between the grapple blocks and the wall. Jump and tap grapple while aiming diagonally to be pushed into the wall just the right amount. Samus should be one tile below the grapple blocks and fully in the wall. Too short a tap and the next grapple will not work, too long and Samus will be stuck in the wall. Grapple diagonally again to be pushed into the transition.