Emmm. I think for arena is just impossible to make him working. I mean, he has 0 prot, zeeeerrrrooooo, and yes, every time he takes damage he has a 50% of getting foresight.
With full g12 piezes he has 24k health. If modded only for health he could reach what, 33k, 35k health?
zHan shot first bypass foresigh hits him twice for 38 - 45k dmg (regular modding) and bye bye bb8 on first turn.
Even with great secondaries boosting his prot he will be dead in turn 1 always.
Maybe is great in raids or TB, but in arena with the current meta no way.