Unless our reliance on India for the basic necessities can be substituted with an alternative, I'll say DREAM ON. Madhesi know this and that is why they're so BALLSY. Cursed with the treacherous terrain, our only hope will be China. If we can get food and fuel from China, then we have something to start with. Other than that, I don't see how you can defeat the Madhesi.
Look towards the North, learn Chinease and make your moves. That's all we can do right now.