Look under the plate. Is the "B-prophile" (center groove) present? If it reveals a flat topsheet under the plate (NO groove), you can chuck the hostage plate and put on whatever binding you want. If the groove is there, you can only mount a binding without any middle screws in the mounting pattern. Most Salomons for example.
You should be able to mount ANY Atomic binding on the hostage plate, but they all tend to SUCK in my experience!