Hi,
My suggestion is for you to figure out what needs to be changed in mojoPortal to support your needs then let me know and maybe I can make it possible by configuration. ie I think you should figure out what code changes are needed and then let me know so I can review the needed changes and integrate them without breaking other currencies.
I am not in a position to test with Indian currency transactions and I'm, not sure that PayPal even supports it.
Best,
Joe