Sadly, I do not see this happening.
Let me put it this way: If I thought for one moment that someone was responsible for the death of my only child, the last thing I would want to investigate is what happened to the person that killed my child. I wouldn't care. I would be obsessed with finding out what happened to my baby.
I do believe Jonah has been supportive of the Zahou's efforts though.
I just don't fault Dina for not being supportive of it. It's the mother in me.
But I certainly wish it was playing out like you stated and they could come together.....