I do see Juan Pablo’s point here. I think organizations who wish to partner with WGI in a particular country where there is a pre-existing member organization should be able to do so but to make clear, between all parties, what the relationship will be.
From the grammar perspective a member organization would be an organization that is a member. An organizational member could be an individual that is a member of an organization.
I do think that Brian’s thought about associates is an important possibility as well. Making a broad range of contact possibilities will expand our ability to communicate.