Agree that UI2 via touchscreen could be useful
did you ever try it?
We did ;-)
We have tested UI2 on an HP Touchsmart. It has some UI 'dead ends' when navigating some screens and when playing media etc. But in terms of the 'scale' of UI elements and its general usability for finger control its actually not as bad as we expected.
So with a few pretty minimal UI additions it would a reasonable option.
All the best