Not in Pakistan unless you are women married to Pakistani men. In all other cases your only option is fake ID card.
This isn't true, only Modi Cow government started granting to few thousands hindus. Anyway even if every Pakistani hindu moved to India it will be like drop in the ocean. Bangladesh doesn't even take back their own Bengalis.
2015 is when Nadra started to get serious about whole CNIC verification. My distant relative CNIC was blocked because in their family tree some Afghani was added. But your fiance case look more complicated.