Is there anything at all that can happen during this Conclave that may bring sedevacantists back in communion with the Church?

I don't mean to be heretical. And I also don't know much about sedevacantism as a movement, other than that they believe the Chair of Peter is empty due to a disagreement about the validity of Vatican II, etc. But my heart is so pained that they have so much misplaced passion, and I would love it if there was a way to bring them back into communion with the Church--validly!

If there was an overwhelming sign from the Holy Spirit (a cardinal's face in the sky, a unanimous proclamation of one name, a dove with an olive branch landing on his shoulder), would that be undeniable enough? Or if the new pope walked back or added nuance to the parts of Vatican II that they disagree with?

Or is it already too late?