(It should be noted that this is a joke; I have collected all of the strange opinions about the place of the organ in the TLM I have met or dealt with and attempted to craft an "ideal" instrument on the basis of them.)
I think that there should be a 32' Precentor, the which, probably, would need to be mitred. Whatever, its sound should be worthy of the Lord's manipled and great mercies. On the other hand (though I stand to be porrected), the sound of it might be difficult for the little old ladies to cope with.
I contemplated an 8.34' Voix Cleriquois Celeste on the Silentium, as well, to more accurately anticipate the intonations of the Gloria & Credo according to the more common American usage.
Not the same. Mitred pipes are constructed so that each pipe is bent over at the top, sort of like the handle of an umbrella. By this means very lengthy pipes can fit into a space that would not accommodate them if they were full length, or not mitred. Being 'mitred', and not 'stopped' (as is your gedeckt), the vibrating air column achieves its normal length, though it is 'bent' - whereas in your stopped pipe the vibrating column hits the stopper, and doubling back doubles its length, thusly sounding an octave lower than it would were the stopper removed. Mitred elements are also made use of in carpentry, and, likely, other constructional disciplines.
For a model of a tremulant voice, one could hardly do worse than the inimitable Anna Russell singing "I love the spring" (start at the 1:27 mark for the 30 seconds of explanation preceding her vocal illustration...):
Don't forget the 2-note 128' Trompette Apocalyptique en Chamade, for the last 3 bars of the Widor Toccata at Easter. Make sure your congregation is at least 7 1/2 miles away before pulling the stop. You may have to sacrifice your own life (and the structural integrity of your church building) to use it, but it will be worth it.
You might also consider using it for the end of the Dudley Buck Star Spangled Banner during July 4 fireworks.
There seems to be a generous offering of Byzantine suggestions here. How about a 10 2/3 Greek Fire-o-phone for to engulf priests who won't sing in a blaze of glory.
While in the West we are accustomed to the relatively mild unda maris, in the East you are more likely to find the unda magna procellarum. https://www.youtube.com/watch?v=Ye_YSWTVaCM On some organs it may be labelled as cantans in imbrem.
(Twenty-three years in the organ business and this is what I'm reduced to doing - ha ha)
For Easter you'll need:
8' State Gedeckt 4' Festival Koppelflöte 16' Double Gemshorn-en-Chamade
AND
for Pentecost
the Solo 11 17/45' Vox Polyglottis This rank, made of DOUBLE harmonic reeds, voiced on 150" wind pressure, speaks in tone clusters of three to seven notes, depending on which note is played, as it is wired randomly across the relay.
I was thinking of a 10 2/3-ft. Trombone in honor of that annoying bass trombone player who always has to take the last note of a piece down an octave, even when he doesn't have the root of the chord.
Could there be a reed on a Spanish (or Argentine) organ which sounds insistently unsure of itself, being both harsh of tone and unstable of pitch.... a Vox Franciscus, perhaps?
I can't speak for reeds in the Argentine, but those historic ones on Spanish instruments are known to be quite self-assured. No Pauline 'uncertain trumpets', these!
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