Unfortunately not, in this case. Since there's no coverage of how these events would play out, it doesn't seem fair to let one cast member decide the whole future of the timeline for everyone else.

For Reborn, though, him returning to an adult form could be included as part of him arriving in the setting. Magical stuff tends to get messed up in the transition, so it's possible that coming to Tera would just straight up break or weaken the curse.