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But what are you going to tell your wife when she asks you is the new gun working good? Lie to her? And then loose her trust? Women are funny about stuff like that. Check your local gun laws and if it is cool to use a .22 cal. buy the coolest one you can find and use it for what you told her you was going to use it for. Then you can tell your wife later that you had your eye on the coolest gun you ever seen and was tempted to buy it knowing you wouldn't use it to dispatch those little critters but did not want to lie or deceive her. Then she will most likely jump in your arms and tell you how proud she is of you and that she loves you so much and if you really like this other gun go ahead and get it.And my choice of guns would be a Ruger 10/22. Good luck.
The powderless 22s are called Colibris and Super Colibris and are made by a mexican company named Aguila, and are next to worthless, very inacurate and less powerful than a C02 pellet pistol. Which BTW would be an excellant choice, a crosman 2240, 1322 or 1377 as well as some more expensive air pistols would be perfect as well as some inexpensive plinking and target practice.
If it was me I would buy something I wanted and use an axe handle for a coup de grace device. Chris