I've posted about this in the past on here, but I'll highlight my own situation for the sake of discussion.
My KJN is KKW ranked, as he was on the Masters delegation team for the Olympics in '88. He does not issue KKW certs, as we have never taught the newer formsets, so we really don't practice the KKW curriculum. However, I have some interest in the KKW certification, for no other reason than my KJN's age. He won't be around forever, and after he's gone, I would like to have a connection to the larger body of TKD.
It was the hope of my KJN along with 5 other grandmasters here in the states to create a path to preserve the "old curriculum" of TKD, by forming the United States Taekwondo Won back in 1999. I believe that GM Kyongwon AHN was the senior rank of those 6 grandmaster that formed the USTW. The initial meetings included KKW representatives, and things looked promising.
Ultimately, to do political agendas, and power grabs from individual state representatives, the USTW dwindled to where it is now, which is not much.
I feel as if I am stuck in regards to larger orgs, because we don't practice the newer Moo Duk Kwan forms, nor do we practice the newer KKW forms. So I don't really fit in either larger org as far as curriculums go.
Master Al Cole had given me contacts to the Moo Duk Kwan in Korea, before his passing, and I feel that I have a path of certification in the future after my KJN is no longer with us. Master Cole also expressed willingness for me to travel to train with him to gain certification through the KKW, but unfortunately he succumbed to cancer before I had that opportunity.