Sudhanshu here, from Cheq UPI.
We're a part of YC S23 and our team launched the Cheq UPI payments app specifically to help international citizens and NRIs avail UPI.
Some testimonials from our early customers: https://www.youtube.com/watch?v=4Ct5WY9vOz4
We launched officially in August, and are growing fast. Next time you travel to india, do give us a try :)
PS: We don't need an Indian bank account to help you make payments.