SK1

Acissathar

Yeah, shouldn't be an issue. There's even a small setup for ATB in the 3D Playground tutorial: https://orkframework.com/guide/tutorials/3d-rpg-playground/atb-01-active-time-setup/

gamingislove

Should both be doable - though I can't guarantee that all aspects can be recreated out of the box. It's been a long time since I played Chrono Cross and Xenogears never released in Europe, sadly ...