We mentioned this one a while back, and I was lucky enough to have a spare copy! From 1988, Secret Origins #24, "The All-True, Previously Recorded, Publicly Known, Heretofore Fully Revealed Secret Origin of the Blue Devil" Story by Gary Cohn and Dan Mishkin, art by Ty Templeton. Cain from the House of
Cain's pulling the story out of Cassidy's sleeping mind, with a couple little dream gremlins, but it's all pretty close to the first issue.
Cassidy wakes up later, to give Cain a bit of what-for; and disarmingly describes himself as "a stuntman stuck in a silly suit who gets to play super-hero sometimes!" Which is probably the hook I'd keep for an ongoing...I didn't read the recent New 52 version yet, though.