Hmm, all code is there, the interface is just not specified. Good catch
It's not really supported on selfservicing as remoting is not recommended for selfservicing because of the lazy loading embedded in selfservicing. Adapter is way more efficient in remoting scenario's.
I'll add the ISerializable specification and port my UoW serialization unittests to selfservicing to see if I indeed also get the errors you get. It's recommended to use adapter for remoting scenario's.