I believe the difference between sedevacantist and R & R, or even indult should be less burden in marriage, than with Novus ordo, even conservative not liberal NO wife or husband.
I'm in that situation, when I converted to true, trafitinal catholic faith, so many things I needed to "recalibrate". And that brought many tensions with my wife, we both say we do have a different religion and that is true, fr. Scott was right. My mother also, she doesn't believe that ex cathedra pronoucements are infallible, that Holy Ghost is speaking through him like He spoke through apostles. And many other stuff, even when I showed contradictions from Vatican website between some encyclicals, or Council of Trent and Vatican II council.
It's a hard cross to carry, and very likely could lead to divorce if both wife and husband cling to their faith with resolution and conviction. Also when raising and educating children, there are differences, from sacraments to other daily things....
If I knew this would happen to me, I would rather be alone or marry a trad wife. But I can't now abandon my cross and vow we made before God and people. We have a 2 year old daughter, she is very sweet, intelligent, she needs both parents. I'm stopping to be preachy, apologetic, that didn't work. I need to be more humble, praying more, making real penance and sacrifices for their conversion. My work is nothing without divine grace.