A party could nominate two people from the same state if they were willing to write off the electoral votes from that state for the VP candidate, and if someone was appointed to the Vice Presidency the residency rule would not be an obstacle.
Thanks for the reminder. I should have addressed the question of the electors. Clearly, Billy Boy would have to move from New York, which is second to California in electors. If he were in Alasks, it might be a different story.