This should not be presented as some new policy that shows evidence of a deal.
We have plenty of priests who were allowed to offer Mass in SSPX chapels and ordained in the new rite. Fr. Hesse, Fr. Gruner, and Fr. Kramer are a few examples. The policy of investigating a pries's ordination and making a determination one way or another has been the SSPX's policy for decades.
I remember when Father Voigt was up in Syracuse for many years. He was known to everyone in the northeast as the "bad Novus Ordo priest" and everyone went out of their way to never go to any of his Masses. When we asked the SSPX why he hasn't been conditionally ordained, their answer was that they looked into it and his ordination was valid and that we shouldn't worry about it but that never stopped parishioners and others from avoiding him.
Once Father Voigt left the SSPX for the resistance, I heard that the first thing he did was get conditionally ordained and I heard that he had wanted to be conditionally ordained while he was being persecuted as a Novus Ordo priest who was with the Society but that they wouldn't approve it.
By "Novus Ordo priest with the Society", I am assuming that you mean a priest with the Society ordained in the new rite. According to this terminology, Fr. Kramer is a Novus Ordo priest with the resistance. I think the terms you chose to use reflect a confusion in your position.
Conditional ordinations have never been a blanket policy of whoever was ordained in the novus ordo gets one. It is a more complicated matter than that. It is sinful to repeat a sacrament that is only received once. So no matter where the priest comes from, an investigation into his ordination must take place and at least some reasonable doubt established before he can be ordained conditionally. The only people demanding that a conditional ordination be done to all ordained in the new rite are those who deny the validity of the new rite, i.e. sedevacantists. Archbishop Lefebvre never claimed that all new rite ordinations are invalid and neither has the SSPX. Consequently, neither does the resistance. People who demand the universal conditional ordinations of all priests ordained in the new rite do not understand the true position of Archbishop Lefebvre or the Society he founded.
not trying to be obstreperous, but Lefevbre Smevbre. Archbishop, while I believe a saint, was NOT the POPE nor is he the last word on all things Catholic. He was sound, reasonable and a Holy man for sure, but I believe even He would take issue with an almost Cult of Personality status that has been erected around his every statement. It is a FACT that he teetered on the fence of Sedevacantism as a theory while operating as a Practical (that is to say in "practice") Sedevacantist from 1974 on for the most part. Also true that he felt in prudence that at the time a declaration of such was unnecessary and unwise, at the time. What would he say today? Don't know, couldn't say. What does reason and the faith say, TODAY? More questions than answers I'm afraid. Archbishop's words are a most excellent GUIDE, bur that is it. I don't think its much of a controversy to us folk that there are very serious questions about the rites of consecration of a Bishop and ordination of a priest. Prima facia Pius XII laid down specifically what is inherent in the form of Bishop orders and that was CLEARLY changed. Not sure if that is enough or more than enough, to create a doubt as to validity, but it could, probably does. Prudence would indicate some value to a CONDITIONAL ordination/consecration, which by the way is a de facto NON-REPEATING of a Sacrament by its very nature. Seems like a blanket policy would be a prudent idea to me. Oh, and to the Archbishop as well, note that like us, he was human and could waver from time to time and did, especially if he was in talks with JPII.
Remember the so-called "Nine"? This wavering, certainly understandable if we recognize he very HUMAN Archbishop Lefevbre, was what the whole issue was at that time. Not the propagandized Pius the Tenther conspiracy theory that they just wanted to steal the properties and declare Sede Vacante!