It would go like this:

1) In a completely unexpected move, Cardinal Burke declares to the world the fact of Francis’s heresy;

2) He simultaneously declares that he is seeking ratification of that declaration from his fellow cardinals, and especially from the Roman clergy;

3) Vigano immediately backs him, as do a handful of lesser known bishops (eg., Bishops Strickland, Schneider, and all four Resistance bishops).

4) Over the next 30 days, another dozen bishops and Cardinal Sarah jump on board;

5) Burke declares that, in light of the manifest heresies of Francis (he does not yet see the heresies of the other conciliar popes, but it does not matter), the faithful bishops are going to announce the fact of his heresy, and in a second declaration, that God has therefore deposed Francis);

6) Both declarations take place, with only about 2-3 cardinals and 12-18 bishops ratifying;

7)The Lodge and ѕуηαgσgυє go into full battle mode, unleashing their media machine to warn the world of an impending schism from traditionalist rebels, but to no avail;

8) The traditional bishops announce the convocation of a conclave;

9) Despite the media storm recalling horror stories of the Great Western Schism, Tge conclave takes place;

10) Vigano is elected pope;

11) The shockwave is cause for reflection among the bishops of the world, causing another two dozen to side with Pope Vigano (who has taken the name of Peter II);

12) The only act which Pope Peter II is able to complete before his assassination by Jєωιѕн operatives is to declare all the post-conciliar rites abrogated, and restore the traditional sacraments;

13) Outrage in Catholic circles fuels more defections to supporters of Pope Peter II; another 100 bishops sign on, all of whom submit to conditional ordination/consecration willingly;

14) The conciliar apparatus is caught completely off guard by the swift and unexpected rivalry, while worldwide Judaic and Masonic governments unanimously declare their support for the conciliar occupiers.  This meddling in Church affairs has the unexpected effect of further building Catholic resistance, and 50 more bishops sign on with the pope less Resistance.

15) A new conclave is convened, and elects a little known Mexican bishop Pope Peter III.

16) Bloody persecution of the true Catholics is now unleashed worldwide, and the blood of these martyrs assuages Our Lord’s outrage at our infidelity; the true Catholic Church grows, while the conciliar occupiers, losing ground in light of the brutality of their supporters and their connivance with the brutes, begins to diminish;

17) True Catholic priests begin supplanting modernist bishops and priests worldwide;

18) They are backed and supported by the faithful, who, having found their zeal and courage, begin tossing the modernists out of the dioceses, take up arms against the ʝʊdɛօ-Masonic forces, and exert enough pressure to eradicate conciliar puppets from most sees;

19) The tables have now turned, and instead of Catholic clergy and militia forces on the run, it is the Hudeo-Masonic agitators and clergy who are now in full retreat.

The trajectory is now lined up for a full restoration.

There’s Catholic prophecy that Our Lord would appear at a conclave to personally designate who should be the Pope.  I suspect that Bishop Fellay has a fantasy about himself being this new pope.

Taking it for what it’s worth, the restoration of the Church, I believe, would require direct divine intervention in that, humanly speaking it’s hopeless.

People have been having this fantasy for half a century now.

Well, not with all these details.

With some reflection and character development, perhaps this would make a good novel?

15) A new conclave is convened, and elects a little known Mexican bishop Pope Peter III.

Viva Cristo Rey!

Well, ironically, I actually believe that such a conclave as you describe would be legitimate.  In such a scenario the true Catholics would recognize that 95% of the NO hierarchy “don’t count” ... because they’re not Catholic.  It’s actually one of my criticisms of Universal Acceptance as applied to the V2 papal claimants.  Really, the fact that only a half dozen Cardinals/bishops could be found to back the “dubia” tells me all I need to know about most of them.

I’ve heard it said that 90% of the hierarchy went Arian during that crisis.  Let’s say the Arians had managed to get one of their own elected pope.  If the remaining Catholic hierarchy would then have elected a pope, then he would have been the legitimate pope rather than the Arian.  What you describe in your fantasy would be similar to this and I think legitimate.

True, but apparently Fr. Adrian Fortescue of liturgical fame once killed a man with a pistol shot in self-defense.

Right, but that was an exception to the rule.  Homicide (even justifiable) was long considered an impediment to the priesthood, although of course it could be dispensed.

With some reflection and character development, perhaps this would make a good novel?

Yes. Escapism sells. I'd buy your book.