The Ego sum etc. are to be done if burial is delayed, so in practice they should be done more often than not.

My basic idea is that such a booklet should replace a Gradual and a Missal for singers, such that they have everything they need in a single book, complete with a translation. Day of Burial, All Souls etc should be covered. Think Mass and Vespers but on a small scale… Many singers who can handle a simple sung Mass may not be as confident with a Requiem.

Yes, I have a booklet with all the chants and absolution.

I think that obviously driving to the cemetery means that the In Paradisum should be sung at the church and the Ego Sum resumed at the cemetery.

I do think that the reception should follow that. Even the very NO parish where my family funerals have been understood this.

Funerals can happen in two places actually, so you repeat the exequial Mass exactly. You just do the stuff for the graveside at the church door of the first, at the burial for the second.

They don’t specify because, as I said, the burial could legitimately be delayed even when you’re putting the body in a tomb. Monarchs and other figures come to mind.

it's from the front of the church to the exit (I have no problem extending it with ps 129 with tone 7a if your funeral home team is slow due to the catafalque candles being in the way, but we need one repetition ordinarily); the procession to the grave is with the Benedictus and the psalms of the office of the dead as needed (the Ego Sum is then sung at the graveside again, although in reality nowadays in North America we would pause, then sing the Ego Sum + Benedictus at the grave), but this can be done as a station. It's in all of the manuals.

Fortescue-O'Connell-Reid 2003, p. 453 (assuming that one is walking…):

If the coffin is taken at once to the place of burial, the procession is now formed…As the coffin is carried to the cemetery, the choir sings the antiphon in Paradisum deducant te angeli followed by Ego sum (in full)* and Benedictus. If the distance is great, the psalm De profundis and other psalms of the Office of the dead are said. At the entrance to the cemetery, the antiphon Ego sum is repeated in full.

*They specify this because pre-1960, the funeral antiphons were semidoubled, whereas the office of the dead for the day of the funeral were doubled, and so the sources don't necessarily match the new rubrics.

P. 454 corrects what I said above

You just do the stuff for the graveside at the church door of the first, at the burial for the second.

F-O-R says that the antiphons and all that follows (through Anima ejus… Amen., then the prayers said on the way back to the sacristy) are sung (or said, although really sung is preferred and historically required in most cases) in the church. It is not necessary to repeat this, but it can be done (why wouldn't you?), and the whole service may be repeated another day or in another church (typically both, I think) if burial is delayed.

Also, as in modern practice (although you could do this at the funeral home I suppose,albeit without the expected procession from the church to the place where the body is laid out) the station with Si iniquitates and ps 129 are to be done at the church door (we do it in the vestibule). The next antiphon and the Miserere may be omitted and the Subvenite begun at once (I've done both, it's nice to take up that time with music instead of allowing people to futz around).

Stercky, vol. 2, p. 139ff: Most of this still applies to the 1962.

He confirms that the Exsultabunt and Miserere may be omitted when the body is only received at the church (for him, on what amounts to the street or sidewalk or even the square/parvis or whatever we call it). The psalms are interrupted even the Miserere by skipping to Requiem aeternam and repeating the antiphon when the procession arrives, then the Subvenite begins.

One says the Office of the dead (1962 allows for evening funerals with Vespers, but before, morning funerals only were allowed, so Matins + Lauds, or at least the invitatory and the first nocturn, with or without Lauds), but this may be omitted, although the Subvenite and the Absolution may never be omitted (there are days where a funeral must take place but the Requiem Mass isn't allowed, and so you proceed immediately to the Absolution, with no connection to the Mass of the day, like on a major feast).

p. 148, he confirms that if there is no procession, or if the clergy do not accompany it, everything is said or sung in the church and then on the way back to the sacristy. He says that if the body rests in the church, the In paradisum is omitted (nowadays I think that it is always carried out to the hearse). The whole of the ceremonies may be done in the transept if the body is carried out of the church but it cannot be done easily in even the short procession to the door and to the outside (usually not a problem).

He also confirms that if the prayers are said once, they need not be but may be repeated.