Second Rise of the White Rose?

After the death of Richard III, what is the latest possible date for a Yorkest revival. Bonus points if they succeed.
 
Richard de la Pole (nephew of Richard III) was set to invade with a bunch of German mercenaries in 1514, but was stymied by the conclusion of peace. I'm not sure how successful he'd be- this was before the conversion and before Henry went off the deep end. There may have been a later plot with the Scottish Regent Albany in the 1520s that never got off the ground. The prospect of a Yorkist claimant launching an invasion all but evaporated with Richard's death at Pavia. Even if he hadn't died there, Richard was getting on in age (~45) and had no legitimate children to pass his claim to.

You could possibly conjure something up where Mary marries a Pole (IIRC there was some suggestion of Reginald) and if they produce an heir you'd get Clarence's line on the throne. Though that's arguably not a Yorkist revival, given the Pole's were utterly loyal to Mary and never intended to push their own Yorkist claim to the throne.
 
Iirc the Earl of Huntingdon (Clarence's great grandson) was mentioned as a possible successor to Elizabeth during her near-fatal illness in 1562.
 
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