Think about the other things you want to teach your dog, will the approach you are taking clash?  For instance, if you are wanting to undertake obedience work, your dog will still need to stand on command but this is not a show stand, it's a very relaxed position.  You can use the same command for both but it can rise to confusion for your dog.  Much better to have two different commands then if your dog is standing for show, he knows he may have his feet placed by you - all back to the key of consistency.

We'll continue with our method of using the bait bag only for showing here - the dog then learns that if the bait bag is on, he's showing and mustn't do anything but stand.  You can take this up a level by swinging the bait bag to the left for obedience work and to the front for show but this is best left until your dog has got the idea.

Try not to get too hung up on the stand command itself - the main thing we want the dog to do is to stay!  If you move his feet manually, a stay command can be more effective than a stand - again be careful if you are doing obedience, you may need to use an alternative command.

Always remember to use consistency with your hands too - use one hand for positioning the legs, one hand for feeding - you'll be surprised at how useful this is!  It's also worthwhile to decide on a special treat and use this only for the ring, this again provides a clear signal for your dog on what he should be doing.