If anything, what I'd like to do is get rid of the damn phone's display. The watch can tell me who is calling or texting, my BT headset can be used to accept calls, and for anything I need a bigger screen for my tablet would be far nicer than some tiny phone screen (even at 7+).
Do you actually carry your tablet with you everywhere? If so why would you need a screen-less phone at all? Surely you'd just use your smart-watch tethered to a 3G tablet instead.