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That's normally something very similar to Gestalt characters, so you might want to check over on the Pathfinder forums and get someone to explain how they allow for 2 classes and see if that sparks something for you.
Most of the contributors here on 5e don't mess with portals/entities so not sure anyone might be able to help much. We inherited a lot from the Pathfinder guys though and the code base is very similar.
Have you also tried asking for help over on the Authoring Kit forums?
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