On October 25, I took a brief holiday from the S Lawrence Press Ordo (rite of 1939) and into the Bugninified calendar of 1961/2. Deeming Ss Chrysanthus and Daria to have been reduced to a Commemoration; and the day being therefore free to say a Mass of Saints marked in the Martyrology for the day concerned: in this case, Ss Crispin and Crispinian: I did just that (the English Missal provided information about which of the Commons to use).
If the various forms of the Old Rite are eventually reduced to what Cornish philologists would call a Unified Form, I would put in a plea for the following.
The Bugnini reduction of Simples to Commemorations should not be followed. But it should be permitted, on Semidoubles and Simples, to say the old Sunday Mass, or the Mass of a Saint in the Martyrology, or a Votive, or a Requiem (some of these options are, of course, available under the 1939 rubrics, but not, I think, all).
Having read the excellent point made by Rubricarius, I add: the same liberties should be extended to most Doubles, and those doubles which it is considered should be undisplaceable, should be recategorised as Greater Doubles.