Having studied the Catholic Mass and having been subjected to the study of the conciliar Luther Mass of Pius VI, and this is what feels like an I’ve age ago, what the 62 Missal - with the Second Confiteor - would’ve a stArting point for a greater restoration. Alas with neoSSPX I cannot see them doing the pre1955 Holy Week, as one example. They are too far gone for that.
Our mission chapel gets indulterers from the Fssp time and again because Mass is not offered Sunday here. Dialogue Mass-ism has made some inroads, and hoi poloi singing is encouraged, at least for English hymns. I pray I have done my best with Latin hymns at the offertory and Communion, keeping in mind silence must outweigh constant music, even if it is good; Mozart, Byrd, Elgar, Bruckner, Schubert, Gonoud and the like.
It is those who join in to chant/sing who have not practiced or do so unexpectedly, they are a concern. The schola does not sing much as we have but a few High sung Masses a year. Numbers are too few. The regular choir is two people, ole Kaz the Polish bass bear, and a young lady of Polish ethnicity who has a beautiful soprano voice.
As for postures, I have difficulty kneeling because of the tight squeeze of the pews. If I go down I will remain down. genuflections are replaced with deep reverent bows. Being a very large and tall Kaz Polish pickle restricts movement in the pew.

Thankfully I occupy the last pew on the right hand side and adopt furthest to the right so I am not obstructing anyone. Thus no kneeling for dem bad ole perfidious jujubes at Good Friday, even though the Missal used sticks with the pre1955 oration. Haven’t figured that out yet.
At least there is no flapping……