If you have Zader, that's your best bet. You can use all those enemy buffs/cleanses to your advantage. Zader + Boba allows for MASSIVE damage with Execute and Culling Blade, enough to one-shot chirrut (or anybody else, but chirrut should be your first kill if you can). Once chirrut goes down, you should be able to handle the rest.
Of course, the key is keeping Zader and Boba alive long enough for them to use those specials multiple times each. Try using three taunting tanks, staggering their taunts so when Baze/Nihilus dispel you have another one coming. Ideally, when DN comes around to Annihilate, you have a taut up. Sun Fac, ShT, and STH would be good choices IMO.
Good luck! Let us know how it goes
