I am not sure that the courts will agree with your peculiar definition of "tribal". The concept of tribes (the original english noun tribe refers to "gotra"-s of the Israelis) in India is from British times. They even had the gumption to label some groups "criminal"/ anti-government. So Pakistan and Bangladesh and Sri Lanka use the same word "tribal" as a noun (in english spoken outside this sub-continent the word tribal is an adjective). Of course they have Buddhist and Muslim tribes. So I doubt the courts will agree to your view of the constitution. Maybe you are getting confused with the Tamil term Malai-vada Makkal, which translates as Paharia. In fact the tribes in Javadhi, Yelagiri and some other hills call themselves Karalar Vellalar Gounders (referring to the clouds, their control of water and possibly their origin in the plains) but the plainspeople call them "Malayalees" (which is also used to denote people from Kerala. The Malai Vada Makkal are recognised as ST in Tamil Nadu and speak an older version of Tamil or (in Gudalur) of other Dravidian languages, In Jharkhand and the North East the scheduled tribes have clearly different from the Bengalis, Biharis, Oriyas or Assamese.
In the case of Bhils and Gonds they have recently been giving up their original Dravidian languages and now speak Chattisgarhi or whatever the regional version of Ardh-Magadhi (descended from Prakrit). However I hear that the old languages are still used in religious rituals. Some urban Kurukh speakers are also beginning to refer to Sadri as their "mother tongue".
Replying to this email will send an e-mail to 9000+ members of Jharkhand Forum.