I think you might believe this leading to even parts of Paul's letters not being fully Pauline/uncirc.?! This strains credulity.
Is there anyone in the Bible who's circumcision was made uncircumcision through unbelief? Therefore, could there not be Jews and Gentiles in the uncircumcision?
Is there anyone in the Bible who was of the uncircumcision who became the circumcision? Therefore, could there not be Jews and Gentiles in the circumcision?
If both of these are possible, how does that affect your demarcation of ministry view?