January 1st for centuries was also kept as a Marian feast besides celebrating the Circuмcision, and always known officially as the Octave Day of the Nativity.
As far as the Good Friday Prayer goes, the SSPX retains the Archbishop's exception: they use the term 'perfidious' and do not genuflect.
Not sure what SSPX chapel you attend, but in the four I’ve visited, since 2007, the SSPX priest genuflect for the conversion of the perfidious jews.
In fact, it’s become a “standing joke” at SSPX Good Friday’s to refuse to genuflect with the priest and most of the faithful, who don’t get it.
And finally, it’s because of the jew’s mock genuflections during Our Lord’s Passion that the tradition of our Church Fathers, was to omit a genuflection for them.