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I hope and pray that all Indult catholics save their souls but they still need to convert before this happens.

Are you serious? You would stop and scruple about giving an FSSP man a Catholic burial if he failed to "convert" before death? 

There is only one Faith that saves souls into Heaven, the Catholic Faith.

If you believe all the truths the Catholic Church teaches because God has revealed them, and die in the state of grace, you will save your soul. I believe such Catholics are found in every Trad group, and even in the Conciliar Church.

But that doesn't mean we should all treat the Conciliar Church as low risk. There might only be 2% (or less!) of the population that still has the Faith -- the rest pick and choose what 
THEY FEEL is right, mostly based on their own convenience and what the World believes. Once you start picking and choosing, you're a heretic and you don't have the Faith, period.
Material heretics could still have the Faith. Remember that.

And to a lesser degree, the Indult groups are dangerous, but less so than the Novus Ordo. All should be left behind to increase one's chances -- but there is nothing fundamental that happens when a Catholic "moves upward" into a better lifeboat. That is my point. It is not a conversion. It is just getting smarter, more prudent, and increasing one's chances to keep the Faith.

One does not have to be prudent or wise to save his soul. He could do some really dumb things, trust the wrong people, and end up getting lucky. But going with a PRUDENT and WISE choice of lifeboat to preserve one's Faith during this Crisis increases one's chances of keeping the Faith and not getting swept into countless errors which might cause one to fall into sin and/or material heresy and/or sufferings that God didn't intend for you to endure.

Only God can judge and determine if individual souls "have the Faith" or not. You seem to be talking about material knowledge, which varies in a granular manner from 1 to 1,000,000. But many facts of Liturgy and Church History aren't required to save one's soul. Neither is any particular Catholic private prayer or devotion.  There are essentials that are required to be Catholic, not to mention the virtue of Faith which you can't see, and that is what I was referring to when I spoke about the FSSP supporters being "Catholic".

Yes, it's a mistake to lump in conversative Novus Ordo Catholics with, say, the Orthodox.  Those Novus Ordites still profess the Catholic faith, and many of them would never knowingly deny any Catholic dogma or doctrine.  Many are merely in material error.  Orthodox, on the other hand, profess schism from the Catholic Church.  So the Novus Ordo creates a very muddy situation.