No, one of my friends' relatives got the card this way
They will not do it easily, but as they are not issuing the card separately, you can mention the point that you are not asking for a separate limit. After closing, one no guarantee that they will issue CB
He was trying for 6 months, then he dropped an email to RBIO that SBI is not issuing the card, and also not upgrading the card after a lot of back and forth, they finally did that.
@drvirag I have not tried and tested this method but he is happily using the card as per my friend.
Card Combo was Prime + SC