Whoa up brother!
There are many many churches that are fully OSAS believing that don't believe the body of Christ is a universal, every believer entity.. in case you didn't know.
I believe this also.. where every mention of church is of a localised entity, whether it be AT a particular place.. or representative of all.. eg Jesus saying He will build His church in Matthew 16:18. The former is of a particular ref.. the latter is general but still local. The latter being the case of how we speak of the 'horse is a magnificent animal'.. that isn't a universal horse
So with 1 Corinthians 12:13.. the body here.. is not every believer.. but the local church body. So becoming a member of a local body.. Paul was baptised by immersion in ref to the body he joined.. and then the Corinthians would have been baptised in ref to the church they joined at Corinth.
Also.. there is an entity of every believer-- the Family of God. But this is not the body of Christ.. they are not the same thing.
So anyway... just so you are aware.. I think this is also what DC believers.. we have the same kind of church we go to. Altho I am on the other side of the world of course.
There will be one body of all believers in the end.. but we don't have that yet.
Blessings