Maybe Cold War goes hot but you'd need to tweeze out all the stuff that was future history when it was written.
Not really, at least in mainstream AH books (games are a much different story)
There's a lot of big-name Cold War Hot stuff that takes place right after WWII. After 1950 there's a bit here and there (A Turtledove series, a Conroy book), but anything that's after Vietnam AND is unambiguous AH (ie takes place well before the publication date of the book) is purely the domain of enthusiasts.