Price is a sensitive issue and depends on a variety of factors. Most coffee exporters will quote prices based on shipment from any southern port.
It would help if you reworked your logistic costs, sourcing price, and probable export incentives. Please understand that you enjoy the natural advantage of low logistic costs to the port of shipment for coffee export when you are based in Kerala.
Besides, Kochi has a freight advantage (compared to other ports in India) over countries located west of India. Focus on these markets, leaving out the far-eastern zone (of Asia).