Ammo is hard to find. Just list and sell the shells. Even selling at a reduced price will be offset by not spending money on adapters.
I looked up the Chazel and realized that I had looked at them once and that their business is primarily rifle round adapters. Unless I am missing something these have no extractors, just like a Little Skeeter. While they stay in the barrel, they would be a royal pain to use. At over $250 delivered and tax for a pair, you would have to have an enormous amount of ammo to come out on painfully using it up over just selling it and forgetting the whole thing. They are also out of stock with no estimate of availability.