I've used these setup techniques and was able to get the ball to draw. If you're trying to get it to happen with ease, try to do it with a 5 or 6 iron off a tee. Make sure you're path is going in to out and you have a fairly strong grip (3 knuckles or so) to ensure you close the clubface at impact. You'll know you've got it when the ball goes off to the right and spins back to the left a bit -- if it's too much try to weaken the grip a tiny bit at a time. I agree it's more difficult with an 8 or 9 iron etc but even with one of those if the ball doesn't draw much in flight it will certainly spin to the left when the ball hits the ground which can come in handy.

Also if you're closing your stance a bit, you're actually moving the ball forward in you stance relative to your swing, so you need to make sure you sweep through impact. To draw the ball I think you need to have good ball striking. If the ball doesn't make that lovely "pfffft" sound off the club face, you're not going to make the ball draw.