Potential workaround for using Dual Wield CZ75 in "solo" zombies

[Nehalem]

Create a private match, select your map then enter xpartygo in the console, this will allow you to actually start the private match while being alone.

Once the game has started, you should also enter onlinegame 0 in the console, it will enable the solo pause menu, otherwise you will have the online pause menu (game running in the background, no restart, etc.).

By using this method, the Dual Wield CZ75 shouldn't crash the game, however I haven't played very long games thus I can't confirm it is 100% reliable for the moment.