How about building the app as a
PhoneGap project? It is a framework that allows you to build mobile apps using the web technologies such as JS and HTML5 while providing a bridge for some native device access such as accelerometer, gps etc...
It basically wraps your web app into a mobile app that behaves mostly like native ones. You can use any UI framework within your project such as Kendo UI and JQuery mobile. So converting your mobile website into a PhoneGap app won't take much time nor effort.
Plus Phonegap supports up to 7 platforms and with their new Build service you can have your app compiled and packaged right in the cloud!