From my experience, it seems churches run by Latin monastic orders will do vespers with evening liturgy.
I guess that’s partially true. Parishes under the charge of a Latin order (whether monastic or mendicant) sometimes do Lauds and Vespers, at least, publicly, but that would normally be in places where the monks or friars share the church with the parish. There’s one O.Carm parish I’m familiar with which never did, since there was a full Priory very close by, so the Friars would gather at the Priory chapel for Office rather than in the parish church.
And I’m one to defer to malphono in terms of Syriac liturgy, so it seems pretty organic that the Maronite Church as a [formerly] majority-monastic Church would celebrate daily liturgy or at least offer the rshom koso.
Question for malphono: is the rshom koso non-consecratory like the Byzantine pre-sanctified or does the combination of the Body with the wine make Blood?
The Presanctified (rshom koso) was done on aliturgical days, which included weekdays of Lent. I should note here that, according to authentic tradition, Great Friday is 100% aliturgical, meaning that it was a day when communion was
never offered, rshom koso or otherwise. In any case, the last vestige of rshom koso in the Maronite Church is the one used on Great Friday. (The matter of rshom koso and when it should be used is still a matter of dispute within the “commission” but I digress). The SCC revived rshom koso in a similar way, meaning in imitation of Latin practice for Great Friday only, in the 18th Century (IIRC) using, I think, a version of the ancient form of St Basil, which is one of the forms mentioned by Bar Ebroyo. I understand that the Chaldeans are attempting a revival of a version of rshom koso for use at least during Passion Week, but I’ve not been able to get much detail on that. Nor do I know if such is used by the ACoE. Perhaps our brother
ronyodish can shed more light on those.
Now, whether rshom koso is consecratory is a matter of perspective. Even though the Maronite usage (based on Peter III) diverges greatly from the older Anaphorae of Rshom Koso noted by Bar Ebroyo, the same principles are present. There are two main schools of thought, and the one I follow agrees with Bar Ebroyo in that the Anaphora of Rshom Koso is
not directly consecratory, but it is
indirectly so due to the Rite of Fraction. This is more-or-less the same principle accepted by the Roum (Orthodoxe and Catholique both). The second school looks at in a way similar to the Latins, where the Liturgy of the Presanctified on Good Friday (the post-1955 one) is very clearly not consecratory at all. NB: The Latin Good Friday Liturgy of the Presanctified was mangled in the 1955 Holy Week “reforms” and remains so, but although it wasn’t generally considered consecratory, the older form also used a chalice and contained the Fraction.