This organization will have to be created. No interim board is envisaged, unless the supporting organizations and the existing IANA deem it necessary. Neither side needs to compromise as much. Arguments as to what is more important and which is a better way are deferred until actual experiences can be used to make decisions. Everyone gets a big stake of an explicitly bigger pie.
Little work is needed to stand up the required entities.
There is no need to make a decision on one location for incorporation. Both entities can be incorporated in separate jurisdictions.