Last month I got SBI SimplySave RuPay credit card primarily for UPI. It took 5-6 days after delivery+activation before apps like PayTM started recognising it as a valid mode for UPI.
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Works for all merchant payments only, not for personal UPI ID payments like cab driver (mostly works for retail payments, rarely for online cart checkout payments). And no you can't pay another credit card bill by using this card through UPI.
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Plus there appears to be very strict limits on no of daily txns. On a couple of occasions it started blocking me for the day after having made 4-5 payments (even though total amount for the day was helper 2k)
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Reward points are peanuts, i think half or quarter of what you get on conventional CCs.
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But overall I'd definitely recommend getting it assuming you're a responsible spender. Major upside is that it will clean up the clutter from from S/B account statement by moving all penny txns to CC statement. And then it's a CC end of the day, do some reward points and builds up your Credit Score overtime if you keep making timely settlements.