We did get a much later Captain Thunder (and a Blue Bolt thrown in for good measure) when Roy and Danni Thomas had their versions published by Hero in '87.
I was talking to a couple of fans at a con recently and the subject came up of how some heroes change from their normal i/d to their super powered state and we could think of a number of heroes who have to say/shout a word of power - either magic or scientific. I don't completely subscribe to the standard belief that Marvelman is a replacement
clone of (Shazam) Captain Marvel. He does use a word of power, in his case Kimota. Young and Kid, of course, use "Marvelman" as their word of power.
MM was a replacement, of necessity for Miller, but the costume is completely different from Cap's. No cape, blue, roundel chest emblem. He just looks completely different.
Excuse me, please for going a tad off topic. My excuse is I've always been a fan