Correct me if you think my method is bad.
I don't think your method is "bad", just completely unnecessary. A cocktail shrimp will remove the need to subject any fish, regardless of price, to the effects and stress of a cycle. It may be an ethical judgement, but I don't see why anyone would want to put even a damsel through it for no reason if they didn't have to. There is also no need to have to hunt down the fish if it is not intended to be a permanent resident of the tank.