Moore avoided mention for a while, but yes, before investigating the copyrights, his original plan was that the Watchmen were the Archie heroes, specifically (mostly) the Silver Agers. I believe that he implied that the corpse (the Comedian) would've been the Lancelot Strong (Simon and Kirby) Shield, whereas the lead (Rorschach) would've been a jaded and neurotic (original) Shield, or possibly vice-versa. One assumes that Nite-Owl and Silk Spectre were Fly-Man and Fly-Girl in this iteration, Dr. Manhattan would be Mr. Justice, and Ozymandias would be the Black Hood or the Jaguar, depending on the precise era he was likely recalling.
Then DC bought the Charlton rights (whatever they were, since we know that very few of the books were copyrighted correctly) as a "gift" for Dick Giordano, and editorial steered Moore in that direction, then away when they realized that maybe they should use their investments for something.
Not that I care too much. Moore never really captured my imagination. "Watchmen" was an amusing read at the time, but it didn't exactly change my world view, like it apparently did for some readers (like, y'know, every single writer in the industry today).
One more catch under the Amazing-Man banner, though (depending on how you count such things), should possibly be Namor. Everett obviously took what was most popular about John Aman, the conflicted hero torn in two moral directions, and created one of Marvel's most enduring characters.
And also noteworthy is that, despite the obvious connection in origins to Amazing-Man, Morisi wanted Thunderbolt to be the new Daredevil, but Biro wouldn't part with the rights. Hence the asymmetric red and blue costume Cannon wears.