The Thad Rybka pocket holster is the way to go since the wallet holster is no longer a legal option. I've used both, and the wallet was superior, but you take what you can get. The belt buckle is cool but is going to get you a lot of unwanted attention unless you trouble to wear garments that cover it. It may also be illegal in your area. I've fiddled with one enough to decide that the draw from it is less convenient than from the pocket holster. I've seen others use the freebie holster as a boot holster, but I'd be concerned that the gun could drop out since only gravity and a little friction hold it in place. At best, it'd fall inside the boot. At worst you'd lose the gun. I've never used the big plastic folding grip, but those I've talked to who do use it say it is only okay. Apparently, the big complaint is that the revolveris held less than completely rigidly in place. Some users find that "slop" annoying. I agree with you about the kydex necklace thingy. There must be a better way to execute that idea.
Now, for a little secret method of carrying these revolvers revealed to me by a friend who has made a career out of being disreputable. It works best with the .22lr variants. You need a watch with a metal band, bigger Rolex style watches are ideal, and a long sleeve shirt. you simply tuck the revolver under the watchband on the inside of the wrist. You can use a rubber band or a little tape to help hold it in place. It's then covered by the shirt sleeve. I've seen him carry his past metal detector wand weilding security guys at clubs and such. When the wand beeps, he innocently pulls his sleeve up a little on the face side of his watch and says "Oh, it's just my watch!" This trick probably won't work against more professional sorts, but it is worth knowing.
