That would be working as intended, besides the resignation. Any ticket with Trump as VP is putting him next in line, as intended.

The people would be knowingly voting for that, and he would have to win the election of course.

After a review of the amendment, I don't believe it would be a "narrow interpretation" to read the text of the law and apply it.

Are you saying it wouldn't be okay for him to be VP and take the helm if Vance died? I think that would be okay, per my reading.

The deception/switcharoo is a different problem, not really related to running three times. Biden could have made Kamala President Day 1 as well.