Sbm cards are of by fintechs like onecard, paisabazaar.
So it depends on them ... specially paisabazaar.
Only one fintech, KiWi launched upi on cc with the help of axis, still the payments failure rate is high.
If any bank has high profits because of upi on credit card, then paisabazaar and sbm may push upi on cc .....
NOTE
*Sbm rupay cards are of gild and paisabazaar cards which are given only on fd.
** You can shift that fd's to hdfc, axis, pnb, bob and on fd lien you can get credit card. (Hdfc marks fd lien cards as unsecured only, 99.9%)