Cameron Crowe doesn’t traffic in regrets, except maybe one. He almost cast David Bowie in “Almost Famous” — the Oscar-winning 2000 movie loosely based on his life as a teen journalist on the road with a rock band — but didn’t.

His original plan, Crowe told The Post in an exclusive interview, was to cast Bowie as Rocky Fedora, “a Peter Frampton–type character who’s working with this British, Brian Epstein–style publicist named Russell De May.”

But then the script evolved. Side characters muscled forward, the ensemble swelled, and Rocky vanished. 10

“I still feel bad about it,” Crowe lamented. “It was really tough to lose that character, and to lose Bowie.”

In his wildly entertaining new memoir, “ The Uncool ” (Avid Reader Press / Simon & Schuster, out Tuesday), Crowe describes

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