Oh man you want to prove that there was Sanskrit and Devnagari in pre vedic era? Which Vedic color brush you are using now?
So you are saying Ram existed before pre vedic era around 17 million years ago and monkey made the sky bridge (sethu)and Ram was speaking in Sanskrit? So why Sanskrit has no antiquity above 2000 years (or closely) . In this case which language was used by Ram, Hanuman and Sita?