Captain Miracle, of course.

Though one panel (which is all I recall ever seeing, though it's been years since I reread the series) is probably fine in theory. (I won't use the term 'fair use' since it tends to provoke Mike Chary, but single panel uses of the other company's characters for in-jokes and the like have been done before without anyone's bringing out the legal big guns.)
Besides, if DC really wants to get into it, they have a Supreme Court decision that says that the Fawcett Captain Marvel infringes their Superman rights. That at least suggests that DC could get an injunction against a derivative work of a derivative work of Captain Marvel, probably infringing on the preceding work at both stages[1], at least for as long as it took to sort out the rights. Given that they didn't AFAIK bother about Miracleman the last time it was published, I'd guess that they're not going to make a stink about it unless it shows any of their trademarked characters on the cover.
[1] Assuming, as I am, that Dez Skinn never actually got around to securing the rights to Marvelman from either the government receiver or Mick Anglo, depending on who actually turns out to own them.