I'm looking for a certain protective case for my iPad Pro 12.9 that may not yet exist, please respond if you know of one that fits this description: - I'd like to use the Apple Smart Keyboard, or any other keyboard that connects with the Smart Connector on the side of the iPad; don't want Bluetooth or other keyboard with batteries that must be recharged. - Back protection and holding strap: The Apple Smart Keyboard covers the screen when closed, but the back is exposed. I want a leather or plastic back protector that has a full opening on the one side to accept the Smart Connector slip-in without removal. Also, when using this large iPad in hand-held mode (sans keyboard,) I find the metal back to be very slippery, making it hard to cradle it in your left hand while tapping/swiping the screen with your right, without the iPad slipping & falling. Of course, you can clamp your hand/thumb tight around one side of the iPad, but I prefer a wide elastic band permanently attached to the back (like my Moko iPad 2 case had,) to slip your hand through for secure holding.