The blog that offered you the opportunity of out-of-the-box thinking on Purgatory now does the same with Predestination (incidental query: why do so many Roman Catholic clergy in North America have the Christian name Calvin? Who is the Saint after whom they are named and who provides them with their Name Day?).
In the Old Rite (I think I must have in mind a Rite older than Pius XII), the second Commemoration to be added to the Collect of each Lenten Feria begins Almighty and Everlasting God, who dost rule over both the quick and the dead together and hast mercy upon all whom thou dost foreknow will be thine by faith and work ... The crucial phrase is "quos tuos fide et opere futuros esse praenoscis". The Prayer goes on to pray that both those kept in the flesh by the present age and those whom the future age has received already may have their sins forgiven.
The corresponding Secret begins God, to whom alone is known the number of the elect which is to be placed in heavenly felicity, and ends by asking that the names of all those whom, commended by prayer, we have taken up, and of all the faithful, may be kept written in the book of blessed predestination.
There! Sort all that out, if you dare. As you are doing so, I will comfortably reflect that one of the most exciting things about the sort of Liturgy that has grown organically and by accretion over many centuries is that it does contain such conundrums ... things that no liturgist of our own day would, in a year of Sundays, ever dream of either composing or including. The newer Rite is not all new in the sense that every word in it has been composed afresh at one moment, en atomoi, in the Bugninizeit. Hundreds of its formulae do truly come from the old Latin books of the first millennium, and in the cases of some them one can rejoice in their rediscovery. But they have been selected (and sometimes 'emended') because they match up to the accepted orthodoxies of just one moment. So the collection as a whole is conceptually flat, unproblematic, and unmysterious. I am reminded of the advice given by C S Lewis's Screwtape, about the importance for Tempters of keeping the Ages separate, so that nobody will learn from another age than his own, and there will be no 'risk' that the characteristic errors of one generation may be corrected by the insights of another.
I think this is important.