The Marian antiphon at a priest’s funeral is an invention of the modern rite which I abhor in part because priests are not that special and because as has been noted here in the past even the lib clergy do it, but as their thing. That is, the presbyterate and only the presbyterate sing the Salve Regina at that moment.

The Marian antiphon is only done after Compline except during the Triduum (where it is omitted) post-55 (well, post-55 and/or 1960, I don’t remember what was changed in what year).

Compline is just moved from the standalone Compline on Nov 1 to Nov 2. So it doesn’t matter that it’s the last prayer, since that was the case before. It’s just on Nov 2 now because there is no II Vespers of All Saints + Vespers of the dead, which is on this day alone said after all is said and done.

And the rubrics seem clear enough (I only check the SSPX web ordo since I don’t have a paper 1960 ordo such as the FSSP’s). No Marian antiphon is prescribed for Compline of the dead said on Nov 3 this year.

The reason is that the office is stripped down to omit some of its more festal or otherwise ordinary features especially many of its later editions; it is not entirely the case that it is a primitive form. Matins has the invitatory (redundant on Epiphany, too festal for the Triduum where the verse about kneeling before the Lord who created us would be highly incongruous with Good Friday in particular). But scholars now believe that the simple tone is a primitive tone and that the office of the dead always had the invitatory, that compilers kept it as a conscious decision to not depart from the ordinary office in this respect.