Credit Card linking with UPI is live for sometime now [0], currently limited to Rupay cards. I have been using my HDFC Rupay CC to pay for Merchant Payments that accept UPI for last month or so.
Any good cards on Rupay? Last time I checked, all the good rewards were on Visa/Mastercard
The good rewards are only possible if the merchants are paying for it through transaction costs. I'd bet on "no" since the national alternatives to Visa/MasterCard usually advertise themselves as "cheaper".