Some theologians are of the opinion that the faithful ought to adhere strictly even in the internal forum to juridical decisions which they believe to be false. Others maintain that exceptions are possible here in the internal forum, because the juridical forum does not deal with norms of divine law, but rather with norms of ecclesiastical law. This question, however, demands further study and clarification.
With this statement, the CDF identifies 2 “parties,” one of which holds that juridical decisions must be upheld in the internal forum, and the other does not. In light of that, there is some question about your assertions like:
The Church has established that denying Communion to those that live in a manner that is objectively at odds with the Life of the Church is not merely a matter of Earthly legalism, but Divine Law.
Apparently, the CDF does not know that this has been established, assuming the juridical forum is what establishes the objective life of the Church. If you mean something else, I cannot see what it could be.
The real difficulty is when the juridical forum, by error or intent, gets it wrong. The true objective of the couple may be a real marriage, and the juridical assessment is what violates the objective norm of the sacraments.
Wisely, Francis puts these questions in the context of a loving marriage, not in a legalist context. The testimony of the couple, who are the ministers of the sacrament, establishes if a marriage exists. This may not fit well with the external forum, but it is the way of “further study.”
FWIW, the scandal caused by allowing the remarried to receive communion is miniscule compared to the scandal caused by excluding them. imo. There certainly are cases where the second marriage is sinful, and communion should be withhled. But even those marriages aspire to blessedness, not sin.