Baze and Chirrut are a nasty combo. Boba is a solid counter. I also like Asajj for her mass dispel. With Boba, you let the buffs stack on Baze until there are a bunch, then hit him with Execute. Darth Nihilus can also end him quickly.
You might also consider Tie Fighter Pilot. If you can dispel Base’s taunt, you can use TFP’s AOE to our ability block on Chirrut and buff immunity on Baze. That will keep Chirrut from clearing debuffs for a turn and keep Baze’s taunt from applying, giving you enough time to focus down Chirrut.