Using GWT for async calls and serialization

I have a rather large and rather old project that is nearly 100% GWT.  For a number of reasons I'd like redo things and write the UI in manual javascript / html / css.  However, it'd be a huge pain to try and serialize all of the data that GWT is currently doing for me.  

I've been thinking about hooking up something like GSON to the remote service servlets to serialize the response but not convinced it is going to work for most of my data structures.  And that doesn't even consider the data structures that are posted to the servlet.

Another thing I've been thinking about is to keep GWT to do the serialization but then to use javascript to manipulate the objects.  I've read in the docs about how to make javascript calls to the java parts, and it looks horrendous, but this seems mostly just for the service calls.  Would the returned objects be just as hard to work with?

Just wondering if anyone has any advice for me?  

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