Oooh, this looks entertaining...
Uh, the only way we can really get this to work is for Katherine of Aragon to die while giving birth to Mary Tudor in February 1516. Let's say that, in the aftermath of Katherine's death, Henry is consoled by Blount (formerly part of Katherine's entourage). Their relationship moves faster than OTL, and they marry in 1517, producing the following issue:
- Elizabeth (1517-23)
- Henry [IX] (b. 1519)
Henry is involved in a horse-riding accident shortly after the birth of a son in late 1519, finally dying from the injuries in March 1520.
What happens next? Presumably, we're looking at some sort of regency...