I apologize if this is a technical monkey wrench in your discussions and can be disregarded on the whole, if it make no sense at all.
Do you expose the outer ring of electrodes in the reactor area?
Why expose the entire face (360 degrees) of the electrode if only the surface facing inwards (180 degrees or less) conducts the energy needed?
There maybe some benefits, although engineering a barrier and revising a whole reactor chamber is a problem…
Just a question to ponder.