Giuseppe Corti Did you try the UTF-8 conversion 0xE2 0x82 0xB9 (e282b9)?
Otherwise you could use Male Extra for 30 days with money back directly the HTML code ₹(#8377)
I came here to create a new thread regarding the same INR problem but fortunately saw this post fist. The HTML code ₹(#8377) solves the problem. Thanks Giuseppe.