Make Sedevacantism popular

I have recently become fascinated with he sedevacantists, a bunch of Catholics who believe that Vatican II embraced heresy and that every Pope since then has been illegitimate. I have been listening to a Podcast (tradcast) of theirs and felt that if I was a Catholic some of their arguments would be hard to deal with. So how can we make them popular. How, with a POD after or around Vatican II can we let them become a significant religious group. Maybe if the Vatican compromises on abortion or some other such issue. Bonus points if the manage to agree on a rival Pope who has the loyalty of a significant percentage of Catholics (which would admittedly make them not sedevacantists but whatever).
 
Paul VI agrees to birth control and compromises on women priests. The lefeverites will go crazy and rally around That Vietamese schimasitc bishop. Maybe they might create a papacy in South america under Pichonet.
 
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