Great article! I especially like the idea of wearing out the kids by having them shake up the wine. I guess I know what to do with the juice that you have to remove from the bottle... "Kids, come shake this bottle for five minutes and I'll give you some juice."
When I've made wine like this in the past I would pull a balloon over the top of the bottle and just poke a tiny hole in it. Really cheap air lock. As the pressure builds up in the bottle, the balloon expands to the point where the air leaks out of the hole. If the hole in the balloon is small
enough you can maintain a slight pressure in the bottle. Condoms work for bottles with bigger openings, though it's a little more strange with that sitting on your counter half inflated.