After some thought I think I am going to try to see if I can use the raw JS message to identify what the class name should be (or, if necessary, send the class name as a string separately). Then I should be able to create an instance of the desired class on the destination side and get its ID on that side from there. The tricky part will be forcing the object, still as a raw JS string at this point, to cast using this ID on the destination side instead of the original class ID from the source side.
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