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Why would the Aputure interfere in any way? That goes on the front, the viewfinder goes on the rear.
Looks a lot like that device is designed to work with a short lens bridge to attach to a 15LWS rail system, which would give you he option to attach a viewfinder to some part of the rail or cage.
vewfinders use a base plate (in order to secure itself to the camera) which collides with the LensRegain