I wouldn't think a Crafty would be stealth enough for a nightclub. What about a vape pen that vaporizes concentrates such as BHO and shatter. That doesn't have a smell either.
Most units that vaporize flowers will have a bit of a smell, some more than others.
The Arizer Air is small and stealth but it too will have a bit of a smell. Do they still smoke cigs in the clubs? If they do that, that would mask the smell of a vaporizer. They have Indian Casinos here in the states where I live, they smoke in the casinos still.
There is no smoking in bars and clubs in most places in the states. the laws don't always apply on the reservations.
The casino that I just went to, on the roadway in, there was a no marijuana sign. A picture of a cannabis leaf with an angled line through it. I live in WA state where cannabis is legal. I guess that Indian Tribe will not be selling cannabis anytime soon.
EDIT
The Grasshopper isn't available to order and buy yet. You have to preorder and then it could take months maybe longer? I'm keeping my eye in the GH, the company is dealing with some issues. Not uncommon with a new vaporizer. It sometimes takes a while to get the bugs out. They may get there.