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It depends on the timing.

Prior to the parties convention. Most likely a brokered convention because nobody would have the votes outright. In the ABB scenario (anybody but Bernie), I could see them reaching out to someone like Bloomberg and putting AOC or Warren in as VP. Hilarity ensues. I would NOT see them reaching out to someone who did not even mount a campaign like Moochelle or the witch.

If it is post-party convention, but prior to the election, then it is still the parties choice. Keep in mind, there will be a VP also on the ticket, so the natural choice would be to elevate the VP to the head of the ticket and choose another VP, but when has logic ever played a part in politics.

If the candidate wins the election, but the electoral college has not selected yet, then it could be interesting. Whatever happens would probably fail on the first ballot, and then the opposite party candidate could actually look more attractive. Imagine a Biden/Warren ticket then Biden croaks prior to the EC. She is far enough moonbat that a lot of Electors could punt and say Trump is not so bad after all. I dont think they could substitute anyone OTHER than the VP for the President, but I could be wrong.

After electoral college votes but before sworn in. VP would be elevated as if it happened after swearing in. No, you cannot substitute their spouse. Once EC votes, succession must be someone they voted for. The only reason we have seen those games in other elections is because it was not a running mate scenario, and those fell into the state appointment scenario where the governor made that decision.

After swearing in, Constitutional line of succession.