I think it's possible to enter the PhD for the poor, but you have to be prepared for the possibly long journey before you enter it. I know people submitting 20-30 proposals to different institutions, till they get the position. I mean in western world. It can take a year or more. So it requires commitment.
I know nothing about education system in India, but maybe you want to try in some western university? In some universities you get paid for doing a PhD,