How to use SystemWebAdapter SessionClient to share only registered keys and ignore the others

Question

I am learning how to migrate a large .net framework application to .net core and am happy with the tooling provided by SystemWebAdapters and RemoteAppClient. The framework application uses session state extensively and it looks like the default behaviour requires me to register ALL session state keys in advance to avoid getting an exception about unregistered keys. This imposes a threat as the frame work application is large and still actively maintained. Is it possible to configure the SessionClient / Session Serializer (i am using AddJsonSessionSerializer) in such a way what only the registered keys are shared and all others are ignored? (So my application will not break if a developer adds a new key without registering)