>>108770645well, I think the similarities between 1963 and Tempest are pretty obvious: pastiche, letters page, mock comics from another era
But what we know about the unfinished 1963 storyline was something like: heroes from the present meet heroes from the past to avert some disaster in the future. The time travel element are the heroes from the far future, trying to avert the disaster.
The heroes from the past (here from 1964 Britain, not 1963 America) are the 7 Stars and others.
The heroes from the present are the league in 2010
I'll never know how much of a stretch it is, but I do know Moore lever lets a good story remain untold. Doing a "stealth" ending to the 1963 debacle seems right up his alley