Making any one of these adjustments will help you begin to draw the ball. Trying all three at once might be overkill! Work on these drills on the practice tee, experimenting with stance, grip and weight transfer until you've got a swing grooved with a ball flight you like.
Practice drawing the ball with a 6-iron. It has enough loft for control and to get the ball airborne, but it isn't so lofted that it will negate draw spin with lots of underspin.
Swing smoothly. The draw requires that the hands, arms and body all gently release through impact, even if the golfer is swinging at high speed.
It's possible to get hook-happy. With a very closed stance, a very strong grip and a good weight shift, you might start hitting duck hooks. These quackers--the mirror opposite of the banana ball--are uncontrollable shots that dive steeply to the left.
If you start overdoing it, gear back on one of the adjustments. Straighten out the closed stance a bit or weaken the grip a tad. You should soon be back to hitting controlled, right-to-left draws.