I wouldn't be opposed to him and Damian being closer in age like they are in DCeased. But I'd rather they just pick up where they left off with him.
I guess doing a deep dive into the psychological effects that of imprisoned in a volcano by an evil version of your father would be interesting (and I actually can't believe how something as traumatic as that was just sorta...shrugged off. Then again, everything involving Jon's time in space was shrugged off. By him and, even more disgustingly, by his parents.)
Right now, though, I'm more concerned with just getting him back.