OMilly and others have not yet called into question the assertion of your 4 ends of justice approach.
These ends are not “mine”. They are the explanation of Cardinal Dulles about what the church teaches. He gave that as nothing less than an expression of fact. The USCCB also gave a list (in 1980), but it only included three ends. The one they left out was protection, which presumably they subsumed under deterrence. Is this still an open issue?
However they have opined that it seems all four ends must be met, not just the alleged primary one, for the punishment to be judged a good object.
You on the other and take a minimalist binary approach and say the primary alone is not only necessary but suffices as well.
No, I have never said this. First, it is not possible to require that all four ends always be met; that ought to be obvious. (Just recall how many have claimed that even capital punishment does not deter murderers.) Second, that was never what I suggested. My point was that the primary objective (justice) must always be met. If there was a way to accomplish the secondary ends as well then that ought to be a consideration, but it is never valid to sacrifice the primary end in order to achieve a secondary one.
If justice is retributive only then it is not justice.
We’ll come back to this point.
However I cannot personally see how retrib CP alone could ever be indirect.
Remove the word “alone” and I would agree with this.
Which leads me to believe the Magisterium is now saying CP for retrib justice alone is immoral in principle …
The Magisterium could never take such a position as it would condemn God’s actions, and deny the legitimacy of the eternal judgment at the end of time. 1022 *Each man receives his eternal retribution in his immortal soul at the very moment of his death, in a particular judgment that refers his life to Christ: either entrance into the blessedness of heaven-through a purification or immediately, or immediate and everlasting damnation.
*There is certainly no concept of protection, deterrence, or rehabilitation contained in the last judgment. It is solely retributive. It is punishment for the sake of punishment.
and also even if done for the Common Good it is now immoral in practice due to reasonable bloodless means being available.
First, as to whether “bloodless means” are adequate, this is a prudential opinion with which people may disagree. That is not a question of morality but of judgment. Second, your interpretation assumes that justice is achieved via a prison sentence, which is also an opinion. Finally, the common good is more than merely physical protection, and if death is necessary to achieve that good, it cannot be immoral. Certainly this is proved by the fact that the catechism recognizes its use as legitimate when necessary to achieve physical protection.
Ender