If they really wanted creatives could actually use the entry of the new actor to introduce a new angle in the storyline.
Let's suppose something happens in Pagdandiya, perhaps the bomb really blows up and the old Aditya goes missing.
Unbeknownst to everyone old Aditya's face gets burned beyond recognition and he is given plastic surgery.
He recalls everything that's happened to him but blames Aryan and to some extent Imlie for it.
He stays away from his family (perhaps keeping an eye on them from a distance)but comes back to Bhaskar Times with a new face and an assumed identity, maybe thirsting for revenge.
We could get a reverse revenge situation happening.
Imlie and Aditya could meet again at work as presumed strangers.
Imlie could even have some deja vu moments with him but be unable to understand why he seems so familiar.
If they were really meant to be Imlie could even fall in love with him again.
This way, as viewers, we would be able to tell if Imlie's love for Aditya had been that for Adi as her pati parmeshwar or truly for Adi himself as an individual.
Bonus, as a stranger, Malini would have no obligation to keep up appearances in front of new Adi and so would show her true face to him.
He could then see for himself what Imlie was trying to tell him all along.