Dogmas become such because the Church defines or proposes them as revealed Truths by God that we are bound to believe in order to maintain the unity of Faith and not fall into heresy. The Church (Magisterium) is the proximate rule of Faith. This is, the teaching Church continuing to the end of time: The whole body of the episcopate, whether scattered throughout the world or collected in an ecuмenical Council IN UNION with the Vicar of Christ, the Pope, the legitimate successor of St. Peter.
Cantarella, you are describing what you and the other sedes believe to be the rule of faith.
If the Magisterium as defined above, is in fact the proximate rule of faith, then all true trads are either in error, or they are in schism. Period. There is no other option.
There is none of this "false council" stuff or "the Seat is vacant" stuff, nor can there be any possible doubt about the legitimacy or liceity of priests, bishops or popes, NO sacraments, NO teachings, etc., because to do so demonstrates an absolute rejection of the above idea and a complete lack of faith in the idea as a whole.
If what you posted above is the truth, then there is none of that, in fact, these ideas are not even an option - that is, if what you described above actually is the truth. Further, if this actually is the truth, and if you and the others actually believe it to be the truth yet do not convert into the Novus Ordo and die apart from it, you will all die in schism or at least error.
If what you described above is actually the truth, there is no way around this.