Another way of maintaining Sola Scriptura and Perspicuity in the face of Protestant disagreement about essential doctrines is the possibility that all of this is cleared up in the deuterocanonical books that Catholics believe are scripture but Protestants do not. That said, this will still rule out Protestantism, and it’s not clear that the deuterocanon in fact clears everything up.
Another way of maintaining Sola Scriptura and Perspicuity in the face of Protestant disagreement about essential doctrines is the possibility that all of this is cleared up in the deuterocanonical books that Catholics believe are scripture but Protestants do not. That said, this will still rule out Protestantism, and it’s not clear that the deuterocanon in fact clears everything up.