EEP nowadays recommend only breeding from pure West African chimps, though many zoos still breed from their hybrid/mixed race chimps, either deliberately or accidentally from time to time. Its always a difficult decision to stop breeding entirely as babies/young are socially important to a group and a visitor attraction too. The downside is where to place the surplus of course.
I don't know of places that deliberately keep 'bachelor' chimp groups. Males will obviously live together, at least in most instances but I'm not sure many places have tried/set this up deliberately with Chimpanzees.
Surely if zoos are persisting with the idea of bachelor gorilla groups then the same for chimps should be 'in theory' easier? Can see in the future that Werribee and Dubbo will need to follow Monarto's lead and create some space for chimp exhibits if there is a surplus of males. Maybe some of the smaller private collections might also be interested.