Can I save my live wallpaper to the phone and uninstall the application?

If you have the pro version of Klwp you can save your wallpapers in the Menu(the three lines in the top left). This walls are stored in your phone in a fold named Kustom. Normally when you uninstall an app, the folders related to the app remain in your phone, but for more security, problably you can make a copy of this folder with an archive explorer like ES explorer and put it in other place of your phone.