Is it possible to integrate Unity Dash in Lubuntu (Fresh Clean Install) apart from installing ubuntu-desktop. If installing ubuntu-desktop is the only option then if installed are there any chances of it breaking the graphic drivers packaging in my system?
No. If you install the Ubuntu Desktop, you will have the choice at log in, of starting a Lubuntu session or a Unity session. I'm afraid you can't run Unity in a Lubuntu session. As for whether your drivers will break or not, will depend on your set-up.