There are huge number of NRIs scattered all over the world and most of them maintain accounts in India. When they visit their home country, they are prone to spend from their rupee accounts. The government has linked all transactions with Aadhar Card. It is difficult for them to visit India for this simple purpose. I think, Indian embassies should be empowered to issue such cards to all NRIs. If the facility does not exist at present, which you may ascertain, you may take up the matter with G.O.I. since you are in a position to do so. A line in reply, about the steps you are taking, is welcome.