First off, let me preface this by stating that I am a right-handed CZ nut. So consider me "biased".
Just a week or so ago, I almost bought this gun (EAA Witness 9mm/22lr
). According to my research, it's a tremendous gun for the money. EAA makes CZ clones, and pretty darn good ones. So you're getting a very good 9mm handgun that's probably worth the $450 pricetag (after transfer) on its own. Then you get an adequate rimfire setup to boot.
You might find a gun that better suits your needs if you spend a few hundred more. But I doubt a superior 9mm/22lr combo package exists for under $600.
So the question is, is using your left trigger finger to operate the controls worth the amount of gun you'll get for the money here? Only you can determine that, but I'd advise at least investigating this option.