First off, According to my burton Rep, The EST/ICS systems are designed as a "Burton-to-Burton" only interface. The equipment has not been tested with other binding applications and is not recommended for use with other brands. This applies to Soft bindings too.
He did mention that using an older Burton plate binding and the new EST mount disk could work. Again, Not tested.
Definitely a "try at your own risk" application.
With all the other choices out there for hard boots why not leave this stuff to soft boot applications. Just a thought.
Cheers.