Kevin Kisner's moving the chest with the club works well. Lee Trevino also had a tip years ago where he described using large rubber bands to keep the wrists from bending too much. Basically chip stiff wristed.
Ray Floyd's chip like you putt method with the heel off the ground works well. Used to play with a low capper who could slide the club under the ball like he was throwing the ball on the green. Very risky for most golfers though.
Of course you can always use what Arnold Palmer told Jack Nicklaus when he first saw him practicing chipping. He told Jack whenever possible to use the putter off the green. Jack said he used that tip the rest of his career.
Afterall the old adage is true. Your worst putt is better than your worst chip.